Celestial Updates: SpaceX's Launches, Curiosity's Tracks, and K2 18b Controversies

0:00 Speaker 1: Welcome to Astronomy Daily, where we bring you the latest

0:03 Speaker 1: news and insights from the world of space and astronomy.

0:06 Speaker 1: I'm your host, Anna, and today we have a busy

0:09 Speaker 1: episode with exciting developments from across the cosmos. We'll be

0:13 Speaker 1: exploring Spacek's relentless expansion of their Starlink satellite constellation, with

0:18 Speaker 1: their latest launch adding even more satellites to their growing network.

0:23 Speaker 1: Then we'll journey to China's Tiangong Space station, where a

0:26 Speaker 1: new crew has just arrived for a six month mission.

0:29 Speaker 1: From Mars, we have a remarkable orbital snapshot of NASA's

0:33 Speaker 1: Curiosity Rover caught in the act of traversing the Red

0:35 Speaker 1: planet's surface. And in the realm of exoplanets, astronomers have

0:40 Speaker 1: made a surprising discovery about super Earth's being far more

0:43 Speaker 1: common throughout the universe than we previously thought. Finally, we'll

0:47 Speaker 1: dive into the recent controversy surrounding potential biosignatures on exoplanet

0:51 Speaker 1: K two eighteen B, where claims of possible alien life

0:55 Speaker 1: have sparked both excitement and scientific skepticism. Is this the

0:59 Speaker 1: breakthrough we been waiting for? For another case of premature speculation,

1:03 Speaker 1: let's find out together. Let's kick things off with today's news.

1:07 Speaker 1: SpaceX continues its steady pace of Starlink launches, ever growing

1:11 Speaker 1: the company's orbital Internet constellation. Last Thursday night, a Falcon

1:16 Speaker 1: nine rocket blasted off from Florida's Space Coast carrying the

1:19 Speaker 1: Starlink six to seventy four mission. Liftoff occurred at nine

1:23 Speaker 1: fifty two pm Eastern Time from Cape Canaveral Space Force

1:26 Speaker 1: Stations Launch Complex forty stack twenty eight tall inside the

1:30 Speaker 1: Falcon nine. Faring these newest additions to SpaceX's Starlink Mega

1:34 Speaker 1: constellation headed toward low Earth orbit, powered by the rocket's

1:37 Speaker 1: nine first stage Merlin engines. The mission represents yet another

1:41 Speaker 1: step in SpaceX's ambitious plan to provide global high speed

1:45 Speaker 1: Internet coverage from space. The workhorse first stage booster, designated

1:50 Speaker 1: bone Thy sixty nine, separated from the rocket's upper stage

1:53 Speaker 1: about two and a half minutes into flight. Six minutes later,

1:57 Speaker 1: it executed a precise landing on SpaceX's whimsically named Drone ship,

2:02 Speaker 1: a shortfall of Gravitas stationed in the Atlantic Ocean. This

2:06 Speaker 1: marked an impressive twenty third launch for this particular booster

2:09 Speaker 1: and its nineteenth Starlink mission specifically. Meanwhile, the rocket's upper

2:14 Speaker 1: stage continued its journey, successfully releasing all twenty eight Starlink

2:18 Speaker 1: satellites about an hour after launch. These satellites will spend

2:22 Speaker 1: the next few days maneuvering into their designated positions to

2:26 Speaker 1: join the operational constellation. The Starlink network now consists of

2:30 Speaker 1: more than seven thousand satellites in low Earth orbit. Together,

2:34 Speaker 1: they operate in a grid that blankets nearly the entire planet,

2:38 Speaker 1: with coverage extending to most areas except the polar regions.

2:41 Speaker 1: This network allows users to connect to high speed Internet

2:44 Speaker 1: from virtually anywhere they can point their Starlink receiver toward

2:48 Speaker 1: the sky, whether that's a remote wilderness area, a ship

2:51 Speaker 1: at sea, or regions where traditional internet infrastructure is lacking.

2:56 Speaker 1: Thursday's mission was SpaceX's forty seventh Falcon nine launch of

3:00 Speaker 1: twenty twenty five, continuing their record breaking launch cadence. Even

3:04 Speaker 1: more impressive, it was their thirtieth Starlink mission this year alone,

3:08 Speaker 1: highlighting the company's primary focus on building out this constellation.

3:13 Speaker 1: At this pace, SpaceX is on track to launch well

3:17 Speaker 1: over one hundred rockets this year, a remarkable achievement for

3:20 Speaker 1: a company that just a decade ago was launching only

3:23 Speaker 1: a handful of missions annually. Meanwhile, China's space program has

3:29 Speaker 1: reached another significant milestone with the successful docking of the

3:32 Speaker 1: Shenzho twenty mission at the Tiangong Space Station. The spacecraft

3:37 Speaker 1: arrived yesterday at eleven forty nine am Eastern Time, beginning

3:41 Speaker 1: what will be a six month stay for its three

3:43 Speaker 1: person crew. The journey to the orbiting outpost was remarkably brief.

3:48 Speaker 1: Shenzo twenty launched atop a long March two F rocket

3:51 Speaker 1: from Juquan Satellite Launch Center in northwest China at five

3:54 Speaker 1: seventeen am Eastern Time, meaning the crew reached their destination

3:58 Speaker 1: in just under seven hours. This quick transit represents the

4:02 Speaker 1: efficiency of China's increasingly sophisticated crude space flight capabilities. Leading

4:07 Speaker 1: the mission is Commander Chendong, who brings valuable experience as

4:10 Speaker 1: this marks his third spaceflight. He's joined by two first

4:14 Speaker 1: time space travelers, chen Jongrui and Wangje. Upon arrival, they

4:19 Speaker 1: were greeted by the three members of the Shenzho nineteen crew,

4:22 Speaker 1: who are currently occupying the station. However, this six person

4:26 Speaker 1: arrangement will be short lived as The Shenzo nineteen team

4:29 Speaker 1: is scheduled to return to Earth on April twenty ninth,

4:32 Speaker 1: just five days after the new crew's arrival. The Tiangong

4:35 Speaker 1: Space Station, which translates to Heavenly Palace, is a T

4:39 Speaker 1: shaped facility that represents China's most ambitious space project to date.

4:44 Speaker 1: While it's smaller than the International Space Station about twenty

4:47 Speaker 1: percent of the ISS's mass, it's still an impressive achievement.

4:52 Speaker 1: China completed the assembly of Chiangong's three primary modules in

4:55 Speaker 1: October twenty twenty two, though officials have indicated they may

4:58 Speaker 1: add more modules in the future. Shenzo twenty marks the

5:02 Speaker 1: ninth crude mission to reach the Chinese space station, demonstrating

5:05 Speaker 1: the steady progress of China's human spaceflight program. Interestingly, the

5:09 Speaker 1: docking coincided with a significant anniversary in space exploration. April

5:14 Speaker 1: twenty fourth marked exactly thirty five years since Nasa'shubble space

5:18 Speaker 1: telescope was deployed from the Space Shuttle Discovery in nineteen ninety.

5:23 Speaker 1: As the Shenzo twenty crew settles in for their half

5:26 Speaker 1: year stay, they'll continue China's ongoing scientific research aboard Tiangong

5:31 Speaker 1: further establishing the country's growing presence in space exploration and

5:35 Speaker 1: cementing its position as one of the world's leading spacefaring nations.

5:40 Speaker 1: Let's head out to Mars now. In an extraordinary development

5:44 Speaker 1: from our robotic explorer on the Red planet, NASA's Mars

5:47 Speaker 1: Reconnaissance orbiter has captured what appears to be the first

5:50 Speaker 1: ever image of the Curiosity rover while it was actively

5:53 Speaker 1: driving across the Martian landscape. This remarkable orbital snapshot was

5:58 Speaker 1: taken on February twenty eighth, which marked the four hundred

6:01 Speaker 1: and sixty sixth Martian Day or SAUL, of Curiosity's mission.

6:06 Speaker 1: The image, taken by the high Rice camera aboard the orbiter,

6:09 Speaker 1: shows Curiosity as a tiny dark speck at the front

6:12 Speaker 1: of an impressive trail of tracks stretching approximately one thousand

6:16 Speaker 1: fifty feet across the dusty Martian terrain. These tracks represent

6:21 Speaker 1: about eleven separate drives that Curiosity performs, starting on February second,

6:25 Speaker 1: as it made its way from the Giddaz Vallus Channel.

6:29 Speaker 1: What makes these rover tracks particularly interesting is their longevity.

6:33 Speaker 1: Scientists expect them to remain visible for months before being

6:36 Speaker 1: erased by the persistent Martian winds. As the rover trudges

6:40 Speaker 1: along at its maximum speed of just zero point one

6:43 Speaker 1: miles per hour, it's creating a visible record of its

6:46 Speaker 1: journey that can be observed from orbit. Doug Ellison, Curiosity's

6:51 Speaker 1: planning team chief at NASA's Jet Propulsion Laboratory, noted by

6:55 Speaker 1: comparing the time high Rice took the image to the

6:57 Speaker 1: rover's commands for the day, we can see it was

7:00 Speaker 1: nearly done with a sixty nine foot drive. This precisely

7:03 Speaker 1: timed image capture provides valuable documentation of the rover's progress.

7:08 Speaker 1: The high Rise camera system is designed to take images

7:11 Speaker 1: with most of the scene in black and white, with

7:14 Speaker 1: only a strip of color down the middle. In this

7:16 Speaker 1: particular image, Curiosity happened to fall within the black and

7:20 Speaker 1: white portion. The tracks lead to the base of a

7:23 Speaker 1: steep slope, which the rover has since successfully climbed. Curiosity

7:27 Speaker 1: is currently making its way to its next scientific investigation site,

7:31 Speaker 1: which contains potential boxwork formations. These intriguing geological features may

7:36 Speaker 1: have been created by groundwater billions of years ago, providing

7:40 Speaker 1: potential insights into Mars's wet past. Engineers at JPL must

7:45 Speaker 1: carefully plan each day's journey considering how the rover's navigation

7:49 Speaker 1: software will handle the challenging terrain it encounters. The rover

7:54 Speaker 1: is expected to reach this new scientific destination within a

7:57 Speaker 1: month or so, where it will conduct investigation that could

8:00 Speaker 1: further our understanding of Mars's ancient history and potential habitability.

8:06 Speaker 1: Next up, in a groundbreaking astronomical discovery, scientists have found

8:10 Speaker 1: that super Earth exoplanets are significantly more common throughout our

8:14 Speaker 1: universe than previously thought. This revelation comes after astronomers detected

8:19 Speaker 1: a small exoplanet in a wide orbit around its star

8:21 Speaker 1: during a gravitational microlensing event labeled OGL twenty sixteen BLG

8:26 Speaker 1: zero zero zero seven. Jennifer Yee from the Center for

8:29 Speaker 1: Astrophysics at Harvard and Smithsonian explained, we found a small

8:33 Speaker 1: planet in an orbit similar to Saturns. This planet is

8:36 Speaker 1: part of a larger sample that shows super earth planets

8:39 Speaker 1: between the orbits of Earth and Saturn are abundant. The

8:42 Speaker 1: abundance of super Earth's was a surprise for context. Super

8:47 Speaker 1: Earths are planets with masses up to ten times that

8:50 Speaker 1: of our own planet, but still significantly less massive than

8:53 Speaker 1: gas giants like Jupiter. What makes this finding particularly remarkable

8:58 Speaker 1: is how it expands our under standing of where these

9:01 Speaker 1: planets can exist. Until now, data from NASA's Kepler Space

9:05 Speaker 1: Telescope mission had established that super earths commonly orbit their

9:09 Speaker 1: stars within a distance equivalent to that between Earth and

9:11 Speaker 1: our Sun one astronomical unit. However, this new research demonstrates

9:16 Speaker 1: that these rocky worlds are also frequently found at much

9:18 Speaker 1: greater distances from their host stars, approximately ten astronomical units away.

9:24 Speaker 1: As Ye noted, previously, there were only upper limits on

9:28 Speaker 1: the numbers of super earths in wide orbits, and there

9:32 Speaker 1: was a suggestion that they might not exist at all.

9:35 Speaker 1: Based on their calculations, the team estimates there should be

9:39 Speaker 1: around zero point three five super Earth planets per star

9:43 Speaker 1: in these wider Jupiter like orbits. This discovery has significant

9:47 Speaker 1: implications for our understanding of planetary formation processes. The distribution

9:52 Speaker 1: pattern suggests planets can be separated into two distinct populations,

9:56 Speaker 1: super earths and Neptune sized worlds in one group, and

10:00 Speaker 1: more massive gas giants in another. This division likely reflects

10:04 Speaker 1: fundamental differences in how these planetary types form. Perhaps most intriguingly,

10:09 Speaker 1: this finding could expand our concept of habitable zones around stars.

10:14 Speaker 1: While Jupiter and Saturn orbit outside our Solar systems habitable zone,

10:18 Speaker 1: super Earth's in similar orbits around hotter stars could potentially

10:22 Speaker 1: fall within regions temperate enough to support liquid water, the

10:26 Speaker 1: key ingredient for life as we know it. The discovery

10:29 Speaker 1: was made possible by the Korea Microlensing Telescope Network, which

10:33 Speaker 1: uses Einstein's theory of general relativity to detect planets. When

10:37 Speaker 1: a planetary system passes between Earth and a background light source,

10:41 Speaker 1: it causes a tiny distortion in that source's light, a

10:44 Speaker 1: microlensing event that can reveal otherwise invisible planets. This new

10:49 Speaker 1: understanding of Super Earth distribution throughout the cosmos not only

10:52 Speaker 1: reshapes our models of planetary system formation, but potentially expands

10:57 Speaker 1: the scope of our search for habitable worlds beyond our

11:00 Speaker 1: Solar system. Finally, today, there's nothing like a good bit

11:05 Speaker 1: of controversy to get scientific debate going. Last week, a

11:09 Speaker 1: team of astronomers made headlines around the world by announcing

11:13 Speaker 1: what they called the strongest evidence yet for life beyond

11:16 Speaker 1: our Solar system. The claim centers around the exoplanet K

11:20 Speaker 1: two to eighteen B, located about one two zero light

11:23 Speaker 1: years away in the constellation Leo, where researchers believe they've

11:27 Speaker 1: detected demethyl sulfide or DMS, in its atmosphere. What makes

11:32 Speaker 1: this finding so potentially groundbreaking is that on Earth, DMS

11:37 Speaker 1: is almost exclusively produced by living organisms, particularly marine algae.

11:42 Speaker 1: According to Niku Marusudan of Cambridge University, who led the

11:45 Speaker 1: research team, these are the first hints we are seeing

11:48 Speaker 1: of an alien world that is possibly inhabited. This is

11:50 Speaker 1: a revolutionary moment. The team used data from the James

11:54 Speaker 1: Webb Space Telescope to analyze K two eighteen b's atmosphere,

11:59 Speaker 1: detecting not only DMS, but also its chemical cousin, demethyl

12:02 Speaker 1: disulfide or DMDS, which is also considered a potential biosignature.

12:08 Speaker 1: Based on these findings, they've suggested K two eighteen B

12:11 Speaker 1: could be an ocean world teeming with life. However, the

12:15 Speaker 1: scientific community has responded with considerable caution. Several limitations have

12:20 Speaker 1: been pointed out that temper the excitement of this announcement.

12:23 Speaker 1: For one, the DMS detection was reported with only three

12:26 Speaker 1: sigma statistical significance, indicating a zero point three percent chance

12:31 Speaker 1: it could be due to random chance. This falls significantly

12:34 Speaker 1: short of the five sigma standard typically required for a

12:37 Speaker 1: definitive scientific discovery. Critics have also noted that the James

12:41 Speaker 1: Webb Space Telescope seems to be pushed to its technical

12:45 Speaker 1: limits for this analysis, and some scientists suggest the researchers

12:50 Speaker 1: might have used a biased model that artificially inflated the

12:53 Speaker 1: significance of the DMS signal in the planet's atmosphere. Manasvi Lingam,

12:58 Speaker 1: an astrobiologist not involved in the research, stated that concluding

13:02 Speaker 1: that DMS has been detected appears to be premature. Others

13:06 Speaker 1: point out scientific inconsistencies, such as Eddie Schweedermann from UC Riverside,

13:11 Speaker 1: who noted the absence of ethane alongside the potential DMS

13:15 Speaker 1: signal something that should be present based on our understanding

13:18 Speaker 1: of atmospheric chemistry. This isn't the first time K two

13:22 Speaker 1: eighteen B has been at the center of such excitement.

13:25 Speaker 1: Matusudan's team previously reported a possible DMS detection on the

13:29 Speaker 1: same planet in twenty twenty three, but that finding didn't

13:32 Speaker 1: hold up under independent analysis of the same data. Matt Genj,

13:36 Speaker 1: a planetary scientist from Imperial College London summarized the situation well,

13:42 Speaker 1: When a discovery is as monumental as the discovery of

13:45 Speaker 1: alien life, the bar is set very high for convincing evidence.

13:50 Speaker 1: The scientific community seems to agree that, while intriguing this

13:53 Speaker 1: potential discovery of extraterrestrial life, signals should be approached with

13:57 Speaker 1: healthy skepticism. As astrobiologist Christopher Glene aptly put it, did

14:02 Speaker 1: they find a needle in the haystack or just a

14:04 Speaker 1: sharp piece of hay? The K two eighteen B case

14:08 Speaker 1: perfectly illustrates the delicate balanced scientists must maintain in the

14:12 Speaker 1: search for extraterrestrial life. As Carl Sagan famously said, extraordinary

14:17 Speaker 1: claims require extraordinary evidence, and there's perhaps no claim more

14:20 Speaker 1: extraordinary than discovering life beyond Earth. This principle sits at

14:24 Speaker 1: the heart of scientific methodology. When approaching potential biosignature detections.

14:29 Speaker 1: The evidence must not just suggest life might be present,

14:32 Speaker 1: but effectively rule out all other reasonable explanations. What we're

14:36 Speaker 1: seeing with K two eighteen B is science working exactly

14:40 Speaker 1: as it should. Initial discovery followed by rigorous questioning and

14:44 Speaker 1: alternative hypotheses. Scientists are especially cautious because we've been down

14:49 Speaker 1: this road before. Remember the excitement in nineteen ninety six

14:53 Speaker 1: when researchers announced potential microfossils in a Martian meteorite, or

14:58 Speaker 1: the twenty twenty claim of phosphine detection in Venus's atmosphere.

15:02 Speaker 1: Both generated tremendous public interest, only to face significant scientific

15:06 Speaker 1: challenges later. These experiences have taught the scientific community valuable

15:11 Speaker 1: lessons about premature announcements. For a biosignature to be truly convincing,

15:16 Speaker 1: it needs to pass multiple independent confirmations using different instruments

15:20 Speaker 1: and analytical techniques. The signal should be unambiguous with strong

15:24 Speaker 1: statistical significance, typically that five sigma standard that gives us

15:29 Speaker 1: ninety nine point nine nine nine nine seven percent confidence,

15:32 Speaker 1: And perhaps most importantly, scientists must thoroughly explore every possible

15:37 Speaker 1: non biological explanation. This is particularly challenging when studying exoplanets

15:42 Speaker 1: like K two eighteen B, because our understanding of their

15:45 Speaker 1: potential chemistry is still developing. What appears biological to us

15:50 Speaker 1: might simply reflect chemical processes we don't yet understand in

15:54 Speaker 1: these alien environments. As one researcher noted, life is the

15:58 Speaker 1: hypothesis of last resort. Rather than seeing this skepticism as discouraging,

16:03 Speaker 1: we should recognize it as the strength of science. Each investigation,

16:08 Speaker 1: even those that turn out to be false alarms, helps

16:11 Speaker 1: refine our techniques and understanding. We're developing better models, more

16:16 Speaker 1: sensitive instruments, and clearer criteria for distinguishing biological from non

16:22 Speaker 1: biological signatures. The search for life beyond Earth is a marathon,

16:27 Speaker 1: not a sprint. While K two eighteen B may not

16:30 Speaker 1: ultimately provide the breakthrough we're hoping for, it represents an

16:33 Speaker 1: important step in our journey, teaching us how to ask

16:36 Speaker 1: better questions, design better studies, and approach future discoveries with

16:41 Speaker 1: the appropriate blend of excitement and skepticism. Well that's all

16:46 Speaker 1: for today's episode of Astronomy Daily. We've traveled from SpaceX's

16:49 Speaker 1: growing Starlink constellation to China's latest space station, crew watch

16:54 Speaker 1: NASA's Curiosity Rover, make tracks on Mars, discovered that super

16:58 Speaker 1: earths are more common than we thought, and examine the

17:00 Speaker 1: fascinating but contentious claims about potential biosignatures on K two

17:05 Speaker 1: eighteen B. I'm anna, and it's been my pleasure to

17:08 Speaker 1: guide you through this cosmic journey of discovery, the universe

17:12 Speaker 1: continues to surprise and challenge us, reminding us that space

17:16 Speaker 1: exploration is as much about careful scientific scrutiny as it

17:20 Speaker 1: is about bold exploration. If you've enjoyed today's episode, I

17:24 Speaker 1: invite you to visit our website at Astronomy Daily dot io,

17:28 Speaker 1: where you can catch up on all the latest space

17:30 Speaker 1: and astronomy news with our constantly updating news feed and

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17:50 Speaker 1: than you would know, and we'd be incredibly grateful for

17:53 Speaker 1: your help in getting the word out there. Thank you

17:56 Speaker 1: for joining me on this astronomical adventure today. The cosmos

17:59 Speaker 1: is vast, mysterious, and filled with wonders waiting to be discovered.

18:04 Speaker 1: Until next time, keep looking up and stay curious about

18:07 Speaker 1: our magnificent universe. Sunday Star is Star is All Star