April 8, 2025

Cataclysmic White Dwarfs, Rapid Military Launches, and Uranus' Time Adjustment

Astronomy Daily | Space News: S04E84
In this episode of Astronomy Daily, host Anna takes you on an exhilarating journey through the latest cosmic discoveries and developments that are reshaping our understanding of the universe. From a rare stellar...

Show Notes
Transcript

Astronomy Daily | Space News: S04E84
In this episode of Astronomy Daily, host Anna takes you on an exhilarating journey through the latest cosmic discoveries and developments that are reshaping our understanding of the universe. From a rare stellar collision to groundbreaking advancements in space policy, this episode is brimming with insights that will spark your curiosity about the cosmos.
Highlights:
- Rare White Dwarf Collision: Join us as we explore the unprecedented discovery of a pair of white dwarf stars on a collision course, located just 150 light years from Earth. This spectacular event is expected to result in a supernova explosion brighter than ten full moons, providing astronomers with invaluable insights into these cosmic phenomena and the nature of type 1a supernovae.
- SpaceX's Military GPS Launch: Discover how SpaceX has stepped in to launch a military GPS satellite that had been waiting due to delays with United Launch Alliance's Vulcan rocket. This strategic shift highlights the Space Force's adaptability in ensuring critical missions reach orbit on schedule, showcasing the importance of having multiple launch options.
- Soyuz MS.27 Crew Launch: Get the inside scoop on the successful Soyuz MS.27 mission, which transported a diverse crew to the International Space Station, including a NASA astronaut with a remarkable background as a Navy SEAL and a Harvard-educated doctor. Learn about the crew's exciting plans during their extended stay aboard the ISS.
- Uranus's Longer Day: Delve into new findings from the Hubble Space Telescope revealing that Uranus's rotation period is longer than previously thought, leading to necessary recalibrations of its coordinate system. This adjustment underscores the importance of continuous observation in refining our understanding of distant planets.
- LIFE Mission Concept: Explore an ambitious proposal for a fleet of space telescopes designed to search for signs of life beyond Earth. Even if no biosignatures are detected, this mission could provide crucial insights into the prevalence of life in the universe, transforming our understanding of our cosmic neighborhood.
For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTubeMusic, TikTok, and our new Instagram account! Don’t forget to subscribe to the podcast on Apple Podcasts, Spotify, iHeartRadio, or wherever you get your podcasts.
Thank you for tuning in. This is Anna signing off. Until next time, keep looking up and stay curious about the wonders of our universe.
00:00 - Welcome to Astronomy Daily
01:05 - Rare white dwarf collision discovery
10:30 - SpaceX military GPS launch updates
17:00 - Soyuz MS.27 crew launch
22:15 - Uranus's updated rotation period
27:30 - LIFE mission concept for exoplanets
✍️ Episode References
White Dwarf Collision Research
[Nature Astronomy](https://www.nature.com/natureastronomy/)
SpaceX GPS Launch Details
[Space Force](https://www.spaceforce.mil/)
Soyuz MS.27 Mission Information
[Roscosmos](https://www.roscosmos.ru/)
Uranus Rotation Study
[Hubble Space Telescope](https://hubblesite.org/)
LIFE Mission Concept
[ETH Zurich](https://www.ethz.ch/en.html)
Astronomy Daily
[Astronomy Daily](

WEBVTT

1
00:00:00.280 --> 00:00:04.080
Welcome to Astronomy Daily. I'm anna bringing you the latest

2
00:00:04.080 --> 00:00:07.879
and most exciting news from across the Cosmos. Today, We've

3
00:00:07.919 --> 00:00:10.640
got a stellar lineup of stories that showcase just how

4
00:00:10.720 --> 00:00:14.480
dynamic our understanding of space continues to be. Coming up

5
00:00:14.519 --> 00:00:17.320
in the next twenty minutes, we'll explore a truly rare

6
00:00:17.399 --> 00:00:21.559
cosmic event that's unfolding relatively close to home, a pair

7
00:00:21.640 --> 00:00:25.079
of white dwarf stars on a collision course that will

8
00:00:25.079 --> 00:00:29.359
eventually create a supernova explosion brighter than ten full moons.

9
00:00:30.120 --> 00:00:33.840
This first of its kind discovery is giving astronomers unprecedented

10
00:00:33.880 --> 00:00:38.000
insight into these cosmic standard candles. We'll also dive into

11
00:00:38.000 --> 00:00:40.840
some space policy news as SpaceX steps in to launch

12
00:00:40.840 --> 00:00:43.640
a military GPS satellite that had been waiting in storage

13
00:00:43.679 --> 00:00:47.439
due to delays with United Launch Alliance's Vulcan rocket. This

14
00:00:47.520 --> 00:00:51.039
satellite shuffle reveals interesting developments in how the Space Force

15
00:00:51.079 --> 00:00:54.560
is adapting to ensure critical missions reach orbit on schedule.

16
00:00:55.399 --> 00:00:57.520
Then we'll head to the International Space Station with the

17
00:00:57.560 --> 00:01:02.240
Soyuz MS twenty seven mission, carrying a fascinating crew, including

18
00:01:02.280 --> 00:01:05.560
a NASA astronaut with an extraordinary background as both a

19
00:01:05.640 --> 00:01:10.280
Navy seal and a Harvard educated doctor. Our planetary exploration

20
00:01:10.359 --> 00:01:13.599
takes us to Uranus, where new Hubble telescope data has

21
00:01:13.640 --> 00:01:17.120
revealed the ice giant's day is actually longer than we've

22
00:01:17.120 --> 00:01:20.200
thought for the past four decades. Those extra twenty eight

23
00:01:20.239 --> 00:01:24.040
seconds might seem small, but they're forcing scientists to recalibrate

24
00:01:24.120 --> 00:01:27.840
everything we know about the planet's coordinate system. And finally,

25
00:01:28.400 --> 00:01:30.719
we'll look at an ambitious proposal for a fleet of

26
00:01:30.719 --> 00:01:34.599
space telescopes working together to answer one of humanity's most

27
00:01:34.599 --> 00:01:38.519
profound questions, how common is life in the universe. The

28
00:01:38.560 --> 00:01:41.040
fascinating part is that even if this mission finds no

29
00:01:41.120 --> 00:01:44.400
signs of extraterrestrial life, it could still tell us volumes

30
00:01:44.400 --> 00:01:47.879
about our cosmic neighborhood. That's all ahead on today's episode

31
00:01:47.879 --> 00:01:50.959
of Astronomy Daily, your window to the wonders beyond our world.

32
00:01:51.159 --> 00:01:56.040
So let's get started. Astronomers have just made an unprecedented

33
00:01:56.040 --> 00:01:59.760
discovery that's captivating the scientific community. A pair of white

34
00:01:59.799 --> 00:02:02.799
doors stars locked in a deadly dance just one hundred

35
00:02:02.799 --> 00:02:06.760
and fifty light years from Earth. This extremely rare binary

36
00:02:06.840 --> 00:02:09.560
system consists of two massive white dwarfs that are on

37
00:02:09.599 --> 00:02:12.759
a collision course spiraling ever closer to each other in

38
00:02:12.800 --> 00:02:15.599
what will eventually result in one of the most spectacular

39
00:02:15.639 --> 00:02:19.840
explosions in the cosmos. White dwarfs are essentially the dense

40
00:02:19.879 --> 00:02:23.360
cores left behind when stars like our Sun die. They

41
00:02:23.400 --> 00:02:25.719
pack roughly the mass of the Sun into a volume

42
00:02:25.759 --> 00:02:30.039
about the size of Earth, making them incredibly dense. Finding

43
00:02:30.039 --> 00:02:32.599
two of these stellar remnants orbiting each other this closely

44
00:02:32.680 --> 00:02:37.520
is extraordinary, and the implications are even more fascinating. According

45
00:02:37.560 --> 00:02:40.960
to research published in Nature Astronomy, these two stars are

46
00:02:41.000 --> 00:02:45.680
already remarkably close, orbiting each other once roughly every fourteen hours,

47
00:02:46.199 --> 00:02:49.960
but this leisurely encircling won't last forever. Over the next

48
00:02:50.000 --> 00:02:53.639
billion years, gravitational wave radiation will cause the stars to

49
00:02:53.680 --> 00:02:57.080
spiral even closer together. By the time they're about to

50
00:02:57.120 --> 00:02:59.879
go supernova, they'll be whipping around each other every thing

51
00:03:00.360 --> 00:03:04.240
to forty seconds. What makes this discovery truly significant is

52
00:03:04.240 --> 00:03:08.280
that it's the first direct observation of what astronomers believe

53
00:03:08.319 --> 00:03:11.360
is the most common cause of type one A supernova.

54
00:03:12.400 --> 00:03:15.560
These cosmic explosions occur when a white dwarf gathers too

55
00:03:15.639 --> 00:03:18.800
much mass. In this case, the heavier of the pair

56
00:03:18.840 --> 00:03:22.639
will likely accumulate material from its partner through gravity, leading

57
00:03:22.680 --> 00:03:27.199
to one or both stars exploding. Lead researcher James Munday

58
00:03:27.199 --> 00:03:30.240
from the University of Warwick was understandably excited when he

59
00:03:30.280 --> 00:03:33.680
spotted this system, noting that for years a local and

60
00:03:33.840 --> 00:03:38.479
massive double white dwarf binary has been anticipated. His international

61
00:03:38.479 --> 00:03:41.680
team quickly used some of the world's largest optical telescopes

62
00:03:41.719 --> 00:03:45.599
to determine exactly how compact the system is, discovering that

63
00:03:45.599 --> 00:03:48.360
the two stars are separated by just one sixtieth of

64
00:03:48.400 --> 00:03:52.280
the Earth Sun distance. Type one A supernova are crucial

65
00:03:52.319 --> 00:03:56.719
tools for astronomers because they serve as standard candles explosions

66
00:03:56.759 --> 00:03:59.800
with known brightness that allow scientists to calculate the distance

67
00:03:59.800 --> 00:04:03.719
between Earth and other galaxies. They're even used to test

68
00:04:03.759 --> 00:04:06.960
theories about the expansion of the universe. Having a front

69
00:04:07.039 --> 00:04:09.759
row seat to the formation of such an event is unprecedented.

70
00:04:10.719 --> 00:04:14.240
When these stars eventually emerge, the resulting explosion will be

71
00:04:14.280 --> 00:04:18.959
truly cataclysmic, about one thousand, trillion trillion times more powerful

72
00:04:19.040 --> 00:04:22.680
than the most powerful nuclear bomb ever created. And while

73
00:04:22.680 --> 00:04:26.160
that sounds alarming, especially considering how close the system is

74
00:04:26.199 --> 00:04:29.120
to our Solar system, we don't need to worry. The

75
00:04:29.160 --> 00:04:33.759
team's calculations indicate this cosmic spectacle won't happen for about

76
00:04:33.759 --> 00:04:38.399
twenty three billion years. Co author Ingrid Pellisoli points out

77
00:04:38.399 --> 00:04:42.600
that finding such a system relatively nearby suggests these binary

78
00:04:42.639 --> 00:04:45.639
white dwarf pairs must be fairly common throughout the galaxy.

79
00:04:46.240 --> 00:04:49.120
If they were rare, astronomers would have needed to look

80
00:04:49.199 --> 00:04:52.279
much further away to find one. She adds that this

81
00:04:52.360 --> 00:04:55.279
is just the beginning, as their survey searching for Type

82
00:04:55.279 --> 00:04:59.639
ONEA supernova progenitors is ongoing, with more exciting discoveries likely

83
00:04:59.680 --> 00:05:02.920
on the he horizon. This rare glimpse into the life

84
00:05:02.959 --> 00:05:06.199
cycle of stars provides a valuable piece in our understanding

85
00:05:06.240 --> 00:05:10.079
of cosmic evolution. By watching these white dwarfs over time,

86
00:05:10.360 --> 00:05:13.839
astronomers can refine their models of how these standard candles

87
00:05:13.879 --> 00:05:17.399
form and behave, ultimately improving our ability to measure the

88
00:05:17.480 --> 00:05:20.759
vast distances of space and understand the fundamental nature of

89
00:05:20.800 --> 00:05:26.040
our expanding universe. Next today, in a significant shift for

90
00:05:26.040 --> 00:05:29.720
the US military's launch plans, Space System's Command announced Monday

91
00:05:29.839 --> 00:05:32.800
that space X will now deploy a Global Positioning System

92
00:05:32.879 --> 00:05:37.160
satellite originally scheduled to fly on United Launch Alliance's Vulcan rocket.

93
00:05:37.560 --> 00:05:40.000
This is no small matter. It represents the second time

94
00:05:40.040 --> 00:05:41.920
in just six months that the Space Force has had

95
00:05:41.920 --> 00:05:45.040
to reassign a military satellite to SpaceX due to continued

96
00:05:45.079 --> 00:05:49.240
delays with ULA's new Vulcan launch vehicle. The satellite in question,

97
00:05:49.360 --> 00:05:53.000
designated GPS three SV zero eight, is the eighth in

98
00:05:53.079 --> 00:05:56.240
a series of ten advanced navigation satellites that provide critical

99
00:05:56.279 --> 00:06:00.720
positioning and timing signals for both military and civilian users worldwide.

100
00:06:01.199 --> 00:06:03.720
It had been sitting in storage at Lockheed Martin's factory

101
00:06:03.759 --> 00:06:06.680
in Colorado, essentially ready to go, but waiting for its

102
00:06:06.720 --> 00:06:10.639
ride to space. Thanks to this launch vehicle trade, as

103
00:06:10.639 --> 00:06:13.600
the Space Force calls it, the GPS satellite could reach

104
00:06:13.680 --> 00:06:16.279
orbit as early as the end of May, a dramatic

105
00:06:16.360 --> 00:06:20.800
acceleration compared to its uncertain timeline with ULA. What makes

106
00:06:20.800 --> 00:06:24.839
this particularly remarkable is how quickly the military can pivot

107
00:06:24.920 --> 00:06:29.759
when necessary. Colonel Jim Horn, Senior material Leader of Launch Execution,

108
00:06:30.279 --> 00:06:33.399
pointed out that this showcases the Space Force's ability to

109
00:06:33.439 --> 00:06:36.800
complete high priority launches with just three months of preparation

110
00:06:37.399 --> 00:06:40.519
compared to the typical planning cycle of two years. This

111
00:06:40.720 --> 00:06:45.120
rapid response capability isn't just a convenience, It's increasingly viewed

112
00:06:45.160 --> 00:06:49.879
as a strategic necessity. Frank Calvelly, the Pentagon's chief of

113
00:06:49.879 --> 00:06:56.240
Space Acquisition, had previously expressed significant concerns about ULA's manufacturing capabilities,

114
00:06:56.639 --> 00:06:59.639
writing in a letter to ULA's owner's Boeing and Lockheed

115
00:06:59.639 --> 00:07:03.920
Martin that currently there is military satellite capability sitting on

116
00:07:03.920 --> 00:07:07.560
the ground due to Vulcan delays. The Vulcan rocket, which

117
00:07:07.680 --> 00:07:11.199
ULA hopes will eventually launch twice monthly, has only flown

118
00:07:11.199 --> 00:07:14.519
on two demonstration missions so far. While the Space Force

119
00:07:14.560 --> 00:07:18.120
did certify the rocket for military launches last month, ULA

120
00:07:18.160 --> 00:07:21.480
faces the daunting task of working through its massive backlog

121
00:07:21.839 --> 00:07:25.079
of eighty nine missions, a number that grew even larger

122
00:07:25.160 --> 00:07:28.639
after the Space Force awarded the company nineteen additional launches

123
00:07:29.000 --> 00:07:32.240
just last week. This isn't the first time the military

124
00:07:32.319 --> 00:07:34.920
has had to pull this kind of maneuver. Last year,

125
00:07:34.959 --> 00:07:38.720
teams from the Space Force, SpaceX, and Lockheed Martin successfully

126
00:07:38.759 --> 00:07:43.600
executed what they called a rapid response Trailblazer mission, preparing

127
00:07:43.639 --> 00:07:46.360
a GPS satellite for launch on a Falcon nine in

128
00:07:46.439 --> 00:07:49.560
less than five months, rather than waiting for its ULA slot.

129
00:07:50.319 --> 00:07:54.439
That mission launched successfully in December. To maintain balance in

130
00:07:54.480 --> 00:07:58.160
its launch portfolio, the Space Force is making adjustments across

131
00:07:58.199 --> 00:08:02.959
its manifest moving a future GPS payload from SpaceX's Falcon

132
00:08:03.000 --> 00:08:06.319
Heavy back to ULA's Vulcan, ensuring that the next three

133
00:08:06.319 --> 00:08:09.480
GPS satellites after this one will still fly on Vulcan

134
00:08:09.519 --> 00:08:12.879
once the rocket is ready. A similar compensation occurred after

135
00:08:12.959 --> 00:08:17.279
last year's reassignment. These advanced GPS three satellites represent a

136
00:08:17.319 --> 00:08:21.639
significant upgrade to the navigation constellation. They broadcast more accurate

137
00:08:21.680 --> 00:08:24.360
signals that are harder for adversaries to jam, and they

138
00:08:24.399 --> 00:08:28.439
include a new channel compatible with Europe's Galileo navigation network.

139
00:08:28.720 --> 00:08:32.519
This allows users to merge signals from both constellations to

140
00:08:32.600 --> 00:08:37.120
achieve even better position estimates, a capability that both military

141
00:08:37.120 --> 00:08:41.360
strategists and civilian applications are eager to utilize. With two

142
00:08:41.360 --> 00:08:44.720
more completed GPS three satellites already in storage and waiting

143
00:08:44.720 --> 00:08:48.159
for launch, plus an upgraded GPS three F design set

144
00:08:48.200 --> 00:08:51.200
to begin launching in twenty twenty seven, the pressure to

145
00:08:51.200 --> 00:08:55.519
get these capabilities into orbit remains high. This satellite swap

146
00:08:55.600 --> 00:08:59.159
demonstrates not just the Space Force's flexibility, but the growing

147
00:08:59.240 --> 00:09:03.279
importance of having redundant launch options to ensure national security

148
00:09:03.320 --> 00:09:07.720
assets can reach space when needed. The fourth crewed space

149
00:09:07.799 --> 00:09:10.120
launch of twenty twenty five is now in the history

150
00:09:10.120 --> 00:09:14.080
books as Soyuz MS twenty seven successfully lifted off from

151
00:09:14.080 --> 00:09:18.240
the Baikoner Cosmodrome in Kazakhstan. The launch occurred right on

152
00:09:18.320 --> 00:09:22.240
schedule at five forty seven UTC on Tuesday, April eighth,

153
00:09:22.600 --> 00:09:25.279
carrying three crew members bound for the International Space Station.

154
00:09:26.440 --> 00:09:30.279
Leading the mission is veteran cosmonaut Sergei Raijakov, who's no

155
00:09:30.320 --> 00:09:33.919
stranger to space travel. This marks his third journey beyond

156
00:09:33.960 --> 00:09:38.399
Earth's atmosphere, following previous missions in twenty sixteen and twenty twenty.

157
00:09:39.279 --> 00:09:42.279
During his second flight, Rjhakov even served as the commander

158
00:09:42.279 --> 00:09:46.159
of the International Space Station during Expedition sixty four, gaining

159
00:09:46.240 --> 00:09:49.000
valuable leadership experience that will serve him well on this

160
00:09:49.120 --> 00:09:52.919
new mission. Joining Rjhakov are two first time space travelers.

161
00:09:53.480 --> 00:09:57.440
Russian cosmonaut Alexei Zubritsky, a senior lieutenant in the Russian

162
00:09:57.440 --> 00:10:00.240
Air Force, is serving as one of the flight engineers.

163
00:10:00.639 --> 00:10:04.879
Born in Ukraine's Zapporijia region in nineteen ninety two, Zubritsky

164
00:10:05.000 --> 00:10:08.120
was selected for the cosmonaut program in twenty eighteen after

165
00:10:08.200 --> 00:10:11.799
graduating from the ivan kojdub National University of the Air Force.

166
00:10:12.720 --> 00:10:15.840
The second flight engineer position is filled by NASA astronaut

167
00:10:15.919 --> 00:10:19.159
Johnny Kim, whose background reads like an action movie script.

168
00:10:20.240 --> 00:10:23.399
Before becoming an astronaut, Kim served as a Navy seal

169
00:10:23.759 --> 00:10:25.759
seeing combat in the Middle East, where he earned a

170
00:10:25.799 --> 00:10:30.039
Silver Star. Not content with just military achievements, he went

171
00:10:30.080 --> 00:10:32.600
on to earn a mathematics degree summa cum laude and

172
00:10:32.639 --> 00:10:35.720
a medical degree from Harvard, becoming both a physician and

173
00:10:35.759 --> 00:10:38.879
a naval aviator before NASA selected him. In twenty seventeen,

174
00:10:39.759 --> 00:10:43.159
the Soyuz spacecraft reached the station in just over three hours,

175
00:10:43.320 --> 00:10:46.039
docking to the Preichal module on the Russian segment at

176
00:10:46.159 --> 00:10:50.600
nine O three UTC. This precise orbital ballet demonstrates the

177
00:10:50.639 --> 00:10:54.279
reliability of the Soyuz program, which continues to serve as

178
00:10:54.320 --> 00:10:58.679
a crucial transportation system for the international space community. With

179
00:10:58.759 --> 00:11:02.679
the arrival of Soyuz twenty seven, the space station is

180
00:11:02.720 --> 00:11:06.840
temporarily home to ten astronauts and cosmonauts. The new arrivals

181
00:11:06.879 --> 00:11:10.200
will join the existing crew ten and Soyu's MS twenty

182
00:11:10.240 --> 00:11:13.960
six teams already aboard. This larger crew will work together

183
00:11:14.159 --> 00:11:18.200
during a handover period until Soyu's MS twenty six undocks

184
00:11:18.240 --> 00:11:21.600
on April twentieth, marking the end of Expedition seventy two

185
00:11:21.960 --> 00:11:26.559
and the beginning of Expedition seventy three. Unlike typical Soyuz missions,

186
00:11:26.559 --> 00:11:29.480
which last about six months, this crew is scheduled for

187
00:11:29.519 --> 00:11:33.200
an extended stay of approximately eight months. They won't return

188
00:11:33.200 --> 00:11:36.159
to Earth until December eighth, giving them ample time to

189
00:11:36.200 --> 00:11:40.080
conduct experiments and perform essential maintenance on the orbital outpost.

190
00:11:40.519 --> 00:11:44.000
Among their potential tasks is at least one spacewalk planned

191
00:11:44.000 --> 00:11:47.679
for the US segment of the station. Johnny Kim, with

192
00:11:47.799 --> 00:11:52.279
his extensive training in EVA operations, is expected to participate

193
00:11:52.320 --> 00:11:56.039
in this critical work outside the protective shell of the ISS.

194
00:11:56.960 --> 00:12:00.559
The Soyuz MS twenty seven mission represents the continuity of

195
00:12:00.600 --> 00:12:05.519
international cooperation in space despite geopolitical tensions on Earth. It's

196
00:12:05.519 --> 00:12:08.279
also the second Soyuz rocket launch of twenty twenty five,

197
00:12:08.600 --> 00:12:11.279
and the first of two planned crude flights from Baikunor

198
00:12:11.360 --> 00:12:14.320
this year. The backup crew for this mission already named

199
00:12:14.320 --> 00:12:17.519
as the prime crew for Soyu's MS twenty eight is

200
00:12:17.519 --> 00:12:21.360
scheduled to launch no earlier than November twenty seventh. As

201
00:12:21.360 --> 00:12:23.720
these three explorers settle into their home for the next

202
00:12:23.799 --> 00:12:27.039
eight months, they become part of the ongoing human presence

203
00:12:27.080 --> 00:12:29.840
in low Earth orbit that has now continued uninterrupted for

204
00:12:29.919 --> 00:12:33.960
over two decades, furthering our understanding of living and working

205
00:12:34.080 --> 00:12:38.960
in the challenging environment of space. Up next, new findings

206
00:12:39.039 --> 00:12:42.559
means new adjustments. Time to adjust our calendars. For Urinus,

207
00:12:42.960 --> 00:12:47.000
the ice giant just got a longer day. Recent analysis

208
00:12:47.000 --> 00:12:50.120
of decade long observations from the Hubble Space Telescope has

209
00:12:50.159 --> 00:12:54.559
revealed that Urinus takes seventeen hours, fourteen minutes, and fifty

210
00:12:54.559 --> 00:12:57.879
two seconds to complete a full rotation on its axis.

211
00:12:58.600 --> 00:13:01.240
This new measurement adds tour twenty eight seconds to the

212
00:13:01.240 --> 00:13:05.639
previous estimate established by NASA's Voyager two spacecraft back in

213
00:13:05.720 --> 00:13:10.039
nineteen eighty six. The original rotation period of seventeen hours,

214
00:13:10.080 --> 00:13:13.399
fourteen minutes and twenty four seconds was determined during Voyager

215
00:13:13.399 --> 00:13:17.200
two's historic flyby, the first and so far only spacecraft

216
00:13:17.279 --> 00:13:20.840
visit to the distant planet. Scientists based that figure on

217
00:13:21.000 --> 00:13:24.600
radio signals from Uranus's auroras and direct measurements of its

218
00:13:24.639 --> 00:13:28.639
magnetic field. This value became the foundation for all coordinate

219
00:13:28.639 --> 00:13:32.559
systems and surface mapping of the pale turquoise world. However,

220
00:13:32.960 --> 00:13:35.960
this new research suggests astronomers may need to reconsider some

221
00:13:36.039 --> 00:13:40.360
of those maps. The Voyager two estimate contained inherent uncertainties

222
00:13:40.360 --> 00:13:43.600
that led to significant problems. Within just a couple of

223
00:13:43.679 --> 00:13:47.840
years after the spacecraft's brief encounter, the orientation of Uranus's

224
00:13:47.879 --> 00:13:51.559
magnetic axis became completely lost, resulting in a one hundred

225
00:13:51.600 --> 00:13:55.799
eighty degree error in the planet's longitude. Coordinate systems based

226
00:13:55.840 --> 00:14:00.559
on that outdated rotation period quickly became unreliable. To resolve

227
00:14:00.559 --> 00:14:04.360
this astronomical dilemma, a team led by Laurent Lamy from

228
00:14:04.399 --> 00:14:08.799
the Paris Observatory undertook the painstaking task of tracking Uranus's

229
00:14:08.799 --> 00:14:13.000
auroras using Hubble data collected between twenty eleven and twenty

230
00:14:13.039 --> 00:14:17.240
twenty two. By monitoring these luminous atmospheric displays over more

231
00:14:17.240 --> 00:14:21.200
than a decade, the researchers pinpointed the planet's magnetic poles

232
00:14:21.240 --> 00:14:25.720
with unprecedented accuracy, enabling them to calculate a more precise

233
00:14:25.840 --> 00:14:30.759
rotation period. The continuous observations from Hubble were crucial. Lamy

234
00:14:30.840 --> 00:14:33.559
noted without this wealth of data, it would have been

235
00:14:33.600 --> 00:14:36.720
impossible to detect the periodic signal with the level of

236
00:14:36.799 --> 00:14:41.840
accuracy we achieved. This methodical approach offers benefits beyond just

237
00:14:42.039 --> 00:14:45.960
updating a planetary factoid. The technique can now be applied

238
00:14:46.000 --> 00:14:49.480
to determine rotation rates for any celestial body with a

239
00:14:49.519 --> 00:14:53.080
magnetic field and auroras, not only within our Solar System,

240
00:14:53.080 --> 00:14:56.279
but potentially for exoplanets and other distant worlds as well.

241
00:14:57.279 --> 00:15:00.519
The updated rotation period provides astronomers with with a much

242
00:15:00.519 --> 00:15:04.559
more reliable coordinate system for Uranus, one expected to remain

243
00:15:04.600 --> 00:15:07.720
accurate for decades until future missions can gather even more

244
00:15:07.759 --> 00:15:11.679
precise data. This improvement could prove invaluable for planning those

245
00:15:11.720 --> 00:15:15.919
future expeditions to Uranus, particularly in designing orbital tours and

246
00:15:15.960 --> 00:15:20.240
selecting suitable atmospheric entry sites for probes. While twenty eight

247
00:15:20.279 --> 00:15:23.519
seconds might seem like a minor adjustment in astronomical terms,

248
00:15:24.039 --> 00:15:27.279
this level of precision represents a significant refinement in our

249
00:15:27.360 --> 00:15:31.240
understanding of the seventh planet from the Sun. The findings

250
00:15:31.240 --> 00:15:35.120
published in the journal Nature Astronomy earlier this month demonstrate

251
00:15:35.200 --> 00:15:38.799
how continued observations from Earth based instruments can still enhance

252
00:15:38.840 --> 00:15:41.120
our knowledge of even the most distant planets in our

253
00:15:41.120 --> 00:15:46.200
Solar system. Finally, today, in our search for life beyond Earth,

254
00:15:46.480 --> 00:15:49.919
scientists are developing increasingly sophisticated tools to answer one of

255
00:15:50.000 --> 00:15:54.840
humanity's most profound questions, are we alone? A groundbreaking mission

256
00:15:54.879 --> 00:15:58.759
concept called Life, the Large Interferometer for Exoplanets, aims to

257
00:15:58.799 --> 00:16:03.320
tackle this question with us precedented clarity. Life proposes deploying

258
00:16:03.399 --> 00:16:06.879
a fleet of four space telescopes working in perfect coordination

259
00:16:07.039 --> 00:16:11.320
around a central combiner spacecraft. These telescopes would fly in

260
00:16:11.360 --> 00:16:16.240
formation tens to hundreds of meters apart, collectively functioning as

261
00:16:16.279 --> 00:16:20.600
a powerful interferometer that combines their light detections to achieve

262
00:16:20.639 --> 00:16:25.759
what no single telescope could. What makes Life particularly revolutionary

263
00:16:26.240 --> 00:16:30.200
is its planned use of nulling interferometry, a clever technique

264
00:16:30.240 --> 00:16:33.799
that cancels out the overwhelming glare from stars by combining

265
00:16:33.799 --> 00:16:37.240
their light out of phase. This creates what scientists call

266
00:16:37.720 --> 00:16:42.240
destructive interference, effectively dimming the stars brilliance while preserving the

267
00:16:42.240 --> 00:16:46.919
faint light from any orbiting planets. Rather than producing direct images,

268
00:16:47.399 --> 00:16:50.720
Life would observe in the mid infrared spectrum, allowing it

269
00:16:50.759 --> 00:16:54.559
to spectroscopically analyze the light from exoplanets and reveal the

270
00:16:54.600 --> 00:16:58.840
molecular composition of their atmospheres. The mission would target dozens

271
00:16:58.840 --> 00:17:01.360
of Earth sized planets residsiding in the habitable zones of

272
00:17:01.399 --> 00:17:06.599
their stars, searching for telltale biosignatures atmospheric gases that could

273
00:17:06.640 --> 00:17:11.079
indicate the presence of life. These biosignatures include the obvious

274
00:17:11.079 --> 00:17:14.559
candidates like oxygen and water vapor, but also compounds such

275
00:17:14.559 --> 00:17:21.000
as ozone, methane, nitrous oxide, demethyl sulfide, and phosphene. The

276
00:17:21.039 --> 00:17:24.599
detection of certain combinations of these molecules could provide compelling

277
00:17:24.640 --> 00:17:30.279
evidence for biological activity. Currently, Life remains a concept spearheaded

278
00:17:30.279 --> 00:17:34.000
by researchers at ETH Zurich in Switzerland. It hasn't yet

279
00:17:34.039 --> 00:17:37.359
been adopted by a space agency, but its scientific potential

280
00:17:37.400 --> 00:17:41.640
is already being carefully assessed. A fascinating aspect of the

281
00:17:41.680 --> 00:17:45.519
Life mission is that it could deliver profound insights even

282
00:17:45.559 --> 00:17:49.359
if it fails to detect any biosignatures at all. Using

283
00:17:49.359 --> 00:17:53.960
sophisticated statistical models, researchers have determined that Life would need

284
00:17:54.000 --> 00:17:58.039
to examine only forty to eighty exoplanets without finding any

285
00:17:58.079 --> 00:18:00.880
signs of life, to conclude with confidence that fewer than

286
00:18:00.920 --> 00:18:03.599
ten to twenty percent of similar planets in the universe

287
00:18:04.039 --> 00:18:08.960
harbor life. A simple positive detection would change everything, notes

288
00:18:09.000 --> 00:18:13.200
astronomer Daniel Engerhausen of ETH Zurich. But even if we

289
00:18:13.240 --> 00:18:17.000
don't detect life, we'll quantify how rare or common planets

290
00:18:17.039 --> 00:18:22.079
with detectable biosignatures really might be. The team employed both

291
00:18:22.119 --> 00:18:26.359
by eesian and frequentist statistical approaches to reach this conclusion,

292
00:18:26.920 --> 00:18:32.240
ensuring their findings are robust across different mathematical frameworks as

293
00:18:32.279 --> 00:18:37.039
the sample size increases. If no biosignatures are detected, scientists

294
00:18:37.039 --> 00:18:40.599
could place increasingly stringent limits on the prevalence of life

295
00:18:40.599 --> 00:18:45.359
in our galaxy. Of course, the researchers acknowledge certain challenges.

296
00:18:46.000 --> 00:18:50.359
Some biosignatures might be missed due to detection limitations, or

297
00:18:50.400 --> 00:18:55.160
planets might be mistakenly included in the potentially habitable category.

298
00:18:55.799 --> 00:18:58.440
It's not just about how many planets we observe, anger

299
00:18:58.480 --> 00:19:02.680
Housen explains, about asking the right questions and how confident

300
00:19:02.720 --> 00:19:05.079
we can be in seeing or not seeing what we're

301
00:19:05.119 --> 00:19:10.079
searching for. Whether life ultimately finds inhabited worlds or determines

302
00:19:10.119 --> 00:19:14.680
they're exceedingly rare. The mission would fundamentally transform our understanding

303
00:19:14.720 --> 00:19:18.839
of life's place in the cosmos. In either scenario, humanity

304
00:19:18.839 --> 00:19:23.279
would gain unprecedented insight into our cosmic significance, either as

305
00:19:23.359 --> 00:19:26.119
one among many living worlds or as something far more

306
00:19:26.200 --> 00:19:31.200
unique than we previously imagined. Well, that's all for today's

307
00:19:31.200 --> 00:19:34.960
cosmic journey. What an incredible set of discoveries we've explored together.

308
00:19:35.359 --> 00:19:38.880
From those doomed white dwarf stars destined for a spectacular

309
00:19:38.920 --> 00:19:42.200
collision billions of years from now, to the Space Force's

310
00:19:42.279 --> 00:19:46.720
agile satellite launch maneuvers, to the successful Soyuz mission carrying

311
00:19:46.799 --> 00:19:50.839
international crew members to the ISS. We've also learned that

312
00:19:50.960 --> 00:19:54.319
Uranus turns a bit more slowly than we thought. Those

313
00:19:54.359 --> 00:19:57.519
extra twenty eight seconds might seem trivial to us, but

314
00:19:57.599 --> 00:20:00.960
they represent a significant refinement in our understanding of the

315
00:20:01.000 --> 00:20:05.279
ice giant, and the proposed life telescope array could finally

316
00:20:05.319 --> 00:20:08.960
help us determine whether habitable worlds are cosmic rarities or

317
00:20:08.960 --> 00:20:13.240
scattered abundantly throughout our galaxy. What links all these stories

318
00:20:13.319 --> 00:20:18.119
is humanity's relentless curiosity about the universe we inhabit. Each discovery,

319
00:20:18.160 --> 00:20:21.279
each mission, each new measurement brings us closer to understanding

320
00:20:21.279 --> 00:20:25.119
our cosmic neighborhood and our place within it. I'm Anna,

321
00:20:25.640 --> 00:20:28.920
and I've been delighted to share these fascinating space developments

322
00:20:28.960 --> 00:20:31.880
with you on Astronomy Daily. If you're hungry for more

323
00:20:31.880 --> 00:20:34.960
space news, remember to visit our website at Astronomy Daily

324
00:20:35.039 --> 00:20:38.599
dot io, where our newsfeed is constantly updating with the

325
00:20:38.680 --> 00:20:42.359
latest discoveries and developments from across the Cosmos. You'll also

326
00:20:42.400 --> 00:20:44.880
find all our previous episodes there if you'd like to

327
00:20:44.960 --> 00:20:48.039
catch up on anything you've missed, and don't forget to

328
00:20:48.079 --> 00:20:50.920
join our community on social media. You can find astro

329
00:20:51.000 --> 00:20:55.799
Daily pod on x, Facebook, YouTube, YouTube, music, Instagram, and TikTok.

330
00:20:56.400 --> 00:20:59.200
Follow us to get updates behind the scenes content and

331
00:20:59.279 --> 00:21:03.279
join the conversation about our amazing universe. Until next time,

332
00:21:03.480 --> 00:21:07.119
keep looking up. There's always something incredible happening in the cosmos,

333
00:21:07.160 --> 00:21:09.160
and we'll be here to tell you all about it.

334
00:21:09.519 --> 00:21:23.000
Thanks for listening to Astronomy Daily Sunday. Star is Star

335
00:21:23.240 --> 00:21:30.880
is Star