Hints of Alien Life Detected, Early Universe Spiral Galaxy Uncovered

[00:00:00] This is Space Time Series 28 Episode 48, full broadcast on the 21st of April 2025. Coming up on Space Time, have astronomers finally discovered hints of alien life in space? A galactic mystery from the early universe? And NASA's Juno spacecraft forced to enter safe mode after it suffers a sudden anomaly? All that and more coming up on Space Time. Welcome to Space Time with Stuart Garry.

[00:00:45] Astronomers have detected the most promising signs yet of possible biosignatures beyond planet Earth. If this proves to be correct, it'll be the most important scientific discovery in history, the existence of alien life. However, the authors of the study, which is reported in the Astrophysical Journal Letters, remain cautious about interpreting the data.

[00:01:07] Using observations from NASA's Webb Space Telescope, the astronomers detected chemical fingerprints for dimethyl sulfide and or dimethyl disulfide in the atmosphere of the exoplanet K218b, which is a sub-Neptune world with some 8.6 times the mass and 2.6 times the diameter of the Earth. The planet has a 33 Earth-day orbit, circling in the habitable zone of its host star, K218,

[00:01:33] a spectral type M red dwarf some 124 light years away in the constellation Leo. This means it receives a similar amount of starlight to what the Earth receives from the Sun. The habitable zone is the Goldilocks area around the star, where it's not too hot and not too cold, but just right for liquid water to exist on a planet's surface.

[00:01:54] On Earth, dimethyl sulfide and dimethyl disulfide are only produced by life, primarily microbial creatures such as marine phytoplankton. While an unknown chemical process or geological activity could be the source of these molecules in K218b's atmosphere, the results are the strongest evidence yet that life could exist on a planet outside our solar system. The observations have reached a 3 sigma level of statistical significance,

[00:02:23] meaning there's just a 0.3% probability that they occurred purely by chance. Now to reach the accepted classification for a scientific discovery, the observations would need to cross the 5 sigma threshold, meaning there would have to be less than a 0.00006% probability that these results are simply a chance occurrence. The authors say they need between 16 and 24 hours of follow-up observations with Webb in order to help them reach that all-important 5 sigma significance.

[00:02:51] Earlier observations of K218b identified methane and carbon dioxide in its atmosphere, and this was the first time that carbon-based molecules were discovered in the atmosphere of an exoplanet in a habitable zone. The results are consistent with predictions for a high-sean planet, a habitable ocean-covered world underneath a hydrogen-rich atmosphere. However, another weaker signal hinted at the possibility that something else was happening on K218b.

[00:03:17] The study's lead author, Nikul Madhusudan from Cambridge University, says his team didn't know for sure whether the signal they originally saw was due to methyl disulfide, but just the hint of it was exciting enough to have another look with Webb using a different set of the observatory's instruments. This moment in history of science will be viewed as a paradigm shift in our search for life. To determine the chemical composition of the atmospheres of faraway planets, astronomers analyse the light from the host star of those planets during a transit.

[00:03:46] That's when the planet passes in front of its host star as seen from Earth. As K218b transits in front of K218b, Webb detects a slight drop in stellar brightness coming from the star. At the same time, some of the star's light passes through the planet's atmosphere on its way to Webb's instruments. And it's the absorption of some of that starlight in the planet's atmosphere that leaves telltale chemical signature fingerprints known as a spectrum.

[00:04:11] And astronomers can use that to determine the composition of the constituent gases in the exoplanet's atmosphere. The earlier tentative inference of dimethyl sulfide was made using Webb's near-infrared imager and slitless spectrograph, as well as its near-infrared spectrograph instrument. And together, these cover the entire near-infrared range of the electromagnetic spectrum. The new independent observations use Webb's mid-infrared instrument, which covered larger mid-infrared wavelengths.

[00:04:39] Matt Houssidan says this provides a separate independent line of evidence, using a different instrument with a different set of wavelength ranges, whereby no overlap with the earlier observations could be implied. And the new signal observations still came in strong and clear. We have found signs of biosignature molecules, either DMS or DMDS or both, both of which are produced uniquely by life here on Earth. Dimethyl sulfide and dimethyl disulfide are molecules from the same chemical family,

[00:05:09] and both are predicted to be biosignatures. Both molecules have overlapping spectral features in the observed wavelength range, although further observations have helped differentiate between the two molecules. However, the concentrations of dimethyl sulfide and dimethyl disulfide in K2 18b's atmosphere is very different from what's seen on Earth, where they're generally below one part per billion by volume. On K2 18b, they're estimated to be about a thousand times stronger, over 10 parts per million.

[00:05:39] Matt Houssidan says earlier theoretical work had predicted that high levels of sulfur-based gases, like dimethyl sulfide and dimethyl disulfide, would be possible on Hacian worlds. Now, given everything scientists know about this planet, a Hacian world with an ocean that's teeming with life is the scenario which best fits the data. As for the host star, K2 18b, it's smaller and cooler than our Sun, having a surface temperature of about 3,184 degrees Celsius.

[00:06:07] That compares to the Sun's 6,000 degrees. It's also much younger than the Sun, 2.4 billion years old, rather than the 4.6 billion years of the Sun. But interestingly, it displays only moderate stellar activity. And that's important because red dwarves are known to regularly erupt in violent stellar flares, which would irradiate any life on the surface of an orbiting planet. Red dwarves are the most common types of star in the galaxy, making up some 75% of all stars in the Milky Way.

[00:06:36] And it's estimated that up to 80% of all red dwarves have planets in their habitable zones. This star also has a second planet orbiting at K2 18c, which is even closer to the star than B. And that may be interacting with K2 18b through gravitational tides. Also, the flares produced by red dwarves can produce erroneous spectral signals when investigating an orbiting planet. And Hussidan says while these results are exciting,

[00:07:04] it's vital to obtain more data before claiming that life has been found on another world. We also want to do more theoretical and observational studies to make sure that there is absolutely no other way we can make this molecule without life. He says while he's cautiously optimistic, it could be previously unknown chemical processes at work on K2 18b that may account for the observations. We are basically establishing here that we can detect that kind of signature, those kinds of planets and biosignatures in them.

[00:07:33] The inference of these biosignature molecules poses profound questions concerning the processes that might have produced them. But the observations are really now just being seen as a starting point for further investigations that are now needed to confirm and understand the implications. This is a monumental discovery. It is very important, but we also have to be extremely cautious. Needless to say, we'll keep you informed. This is Space Time.

[00:08:02] Still to come, a galactic mystery from the early universe, and NASA's Juno spacecraft forced to enter safe mode following a sudden anomaly. All that and more still to come on Space Time.

[00:08:29] Astronomers have discovered a surprisingly large spiral galaxy in the early universe, dating back some 11.4 billion years, to a time when such large galaxies are quite difficult to explain based on current cosmic modelling. In fact, this galaxy is some three times larger than similar galaxies from the same epoch. The findings reported in the journal Nature Astronomy are based on new observations using NASA's Webb Space Telescope. Spiral galaxies are flat, rotating disk structures

[00:08:58] filled with stars, gas, and dust that orbit around a central core. Our solar system orbits within one such spiral galaxy, and is the Milky Way. One of the study's authors, Tamiya Yanyakara from Swinburne University, says when and how galaxy disks grow and form has been one of the outstanding puzzles of astronomy. And seeing a massive well-ordered disk galaxy at a time when the universe was only 2.4 billion years old forces astronomers to rethink just how rapidly and efficiently

[00:09:27] nature can build cosmic structures. See, this galaxy not only challenges existing models and early galactic formation, but also hints that dense, gas-rich environments may well be the cradle for the universe's earliest giants. The discovery was made, as observations were being targeted towards a specific region of the sky which hosts a bright quasar, a superluminal jet shooting out of an active supermassive black hole. Using the Webb data, Naniyakara and colleagues identified galaxies

[00:09:56] within this over-dense structure. They analyzed their distance or redshifts, their morphology, and their kinematics, that is, how they moved across the sky. And it was these observations which led to the serendipitous discovery of the surprisingly large disk galaxy in the field. The galaxy has been dubbed the Big Wheel. It has an optical radius of about 10 kiloparsecs, which is at least three times larger than what would be expected, judging by current cosmological models. And further kinematic analysis

[00:10:25] confirms that this galaxy contains a disk rotating at around 300 kilometers per second. And that's larger than any other kinematically confirmed disks found at similar early epochs. In fact, it's comparable to the size of today's most massive disks. Naniyakara says, the disk lives in a highly over-dense environment, hitting that such an environment may well have favorable physical conditions for early disk formation. Driven to this kind are known to host frequent galaxy encounters, mergers, and gas flows.

[00:10:55] Therefore, in order to have a disk grow early and grow quickly, galaxy mergers in this environment need to be non-destructive and oriented in specific directions. Now, alternatively, galaxy inflows must have carried angular momentum that largely co-rotated with the galaxy's disk. Previous studies revealed that the quasar at the center of this group of galaxies is embedded in a large-scale structure called a proto-galaxy cluster. And this contains a high concentration of galaxies' gas and black holes,

[00:11:22] indicating an exceptionally over-dense environment. Naniyakara says, the discovery paves the way to studying this over-dense environment, which remains a relatively unexplored territory. When we were planning the observations, when we got the first images, we didn't really think that it would be that far away. So it was purely surrendered because that we kind of put a slit on to do some science with it. But then for our amazement, the galaxy was found to be quite far away than we initially thought,

[00:11:51] kind of changed our kind of view of how these things form and evolve, I think. Tell me about what galaxy formation was like 11.4 billion years ago. This is the distance we are looking back into the universe. So it's about 1.5 billion years after the Big Bang, give or take. So what this says is that in the Earth Universe, at least there is one galaxy which has formed very rapidly and had a lot of star formation and things kind of merging into the galaxy

[00:12:20] in an unprecedented way. But the surprise in nature itself is not the discovery of the galaxy itself, but it's kind of morphology, how it looks like as a big spiral, because in our normal models, when we look at these disky spiral galaxies, maybe like our Milky Way or Andromeda, for example, we expect them to grow slowly because when galaxies grow, it either happens through smaller galaxies coming in and merging with it or gas coming into the galaxy from the universe,

[00:12:49] from the certain galaxy medium. So for the spiral structure and this to be intact, it has to happen very slowly because if you have very big galaxies coming and merging very fast, this disky structure will get broken down and that's how you kind of will make like a difficult galaxy or this kind of very non-spiral-like structure. So what has happened here is that while it has grown very fast, it has grown in a way that did not disturb this beautiful spiral arms that we see in the images.

[00:13:18] So it is not very surprising in some ways because it is in a dense field because there's a lot of other galaxies around it and it's about 10 times more denser than the nominal cosmic average at this epoch of the universe. But what it also means is that in the same time, while there are a lot of these small galaxies that might have merged or some gas coming in, it has happened in a beautiful way in some ways that it kind of kept this structure intact while preserving its nature, while growing in size

[00:13:48] and also in mass in the same time because this galaxy is about 100 billion solar masses, which is only about, give or take, about 10 times smaller than our Milky Way. But it is like 11 billion years ago, right? And it is so massive that it is one of the most massive galaxies we have seen in this epoch, regardless of its size. So all of these kind of neat things came in together for this galaxy and that became an interesting result, I think. What does that tell you

[00:14:17] about the influence of dark matter back then? And I guess also the lack of influence, well, it's there, but to a lesser degree, of dark energy. Yeah, so from what I understand, if you have a lot of dark energy, of course, then the galaxies get split out. So it's harder for to form like bigger sources, of course, because everything will be moving away very fast. So the overall bigger picture is that then the dark matter halos that we call them will grow much slowly because things are further away. For the dark matter itself,

[00:14:47] it is hard to compute the dark matter distribution very accurately because you do have to make some assumptions of how the dark matter might be distributed around the galaxy, which we haven't really looked into in detail, but I think with more deep observations, we should be able to look into them. But in these early galaxies, of course, the dark matter is quite concentrated and we expect the stars to have quite a bit of dominance on the distribution. But because dark matter itself is more like we normally model it

[00:15:16] in a Gaussian or some sort of distributed way. So for the spiral arms itself, it has not a strong influence from what I understand. From the spectroscopic readings, were you able to just determine the fact that it's rotating? So there's that Doppler effect there? Or were you able to determine what the galaxy is made of, like the concentrations of different chemical elements? Both in the same time instrument we used, the NERSPEC,

[00:15:45] we used it in a multi-object mode, which means that you have to select where you want to place these slips in the instrument. So we selected like three locations in this galaxy, one going through the center and two in the spiral arms, basically. And because the slips are long, you see which direction the galaxy is rotating. And in this case, you can clearly see how the source is rotating based on the Doppler shift of the emission line of this galaxy. But apart from that, of course, the fact that you see like hydrogen emission

[00:16:14] coming off from this galaxy, you can use that to compute the metallicity of the sources to understand how much oxygen and hydrogen, etc. there is. And the hydrogen alpha emission is also almost a direct proxy for how much star formation there is. And this is why we are kind of surprisingly seeing that this galaxy, while it's very big, is still actively forming stars quite rapidly in a similar speed to a smaller mass. the galaxy. So it's kind of quite high in the same time.

[00:16:44] So at some point, it has to stop because the galaxy at some point stops growing because it becomes too big. But at least in this case, which is growing very fast, we haven't reached that yet. So this is in the inside a large cluster of galaxies. It's sort of supporting our existing cosmic models, isn't it? Yeah. So it is also some sort of a selection effect because if you go back to why this program was kind of developed initially, was to look into a bright quiescer in that field. So the quiescer

[00:17:13] is roughly at the same redshift or at the same location in cosmic epoch as it's thought. You see that in the paper's image as well where you have like this bright star, which is not a star, it's like a strong ASEAN, like about 1.5 billion years after the Big Bang. The whole science case behind this was once you have these massive quiescers, there is a lot of gas that is acceding into it. And from the ground-based observations from the Mu spectrograph on the VLT, the Very Large Telescope in Chile,

[00:17:41] we, in around 2015 or so, we managed to get like a beautiful map of this hydrogen emission which is in Lyman Alpha, which is kind of the Lyman series of hydrogen, extending like very, very far away from the galaxy. So the program was developed to get the hydrogen, the Balmer series hydrogen emission because the Lyman series hydrogen emission has a lot of resonance scattering which makes it really hard for us to compute how much gas is there in this field that is coming into the quiescer to build a large-scale

[00:18:10] structure around it. And the consequence of like having this such a quiescer is that there's a lot of gas coming in and within these gas flows there is gas collapsing and forming stars and galaxies. So technically speaking when you have these massive filaments kind of feeding into a thing you do expect to have a little bit more higher density of galaxies around in the vicinity. So I think this is one of the consequences of this field being a high-dense region because it was selected to be around the quiescer to do a completely different science

[00:18:40] and this was completely like unexpected discovery. The chance to use the James Webb Space Telescope what was that like? That must have been exciting as an astronomer. Oh yeah it was super exciting. So this was one of the first programs that got time but I think it's about four years ago now. But it took a long time to get this paper out but because it was kind of unexpected discovery and then we had to make sure that it was kind of how to frame the synonymity as well because while it's interesting

[00:19:10] we had to kind of show why it is unique as well in the same time. JWST has been quite transformative I think it's probably one of the most thought after observatories at the present time. Yeah it's totally changed our view of the universe hasn't it? It's changed completely. Yeah because we were quite limited back in the day because if you really want to understand like the early universe for example or look into dusty regions around our own Milky Way we had to go to the infrared but the problem was of course because of the atmosphere

[00:19:39] we don't really get a good coverage in that wavelength space. So we did have to go to space and I think having like a big mirror with extremely sensitive instruments made quite a big transformation of what we could see. So now we can see galaxies which were formed like just a few hundred million years like 200 to 300 million years after the Big Bang. So we are kind of pushing the limit already within the first few years of JWST. You're heading towards the cosmic dark ages now aren't you? Yeah yeah so these are like the first galaxies that are being formed

[00:20:09] so technically speaking expectation is we might be able to even see the first stars but it is much because the universe is so big. Well that's the ultimate goal isn't it? Population three stars. Yeah yeah so there's two ways one could do it I guess there's like two ways of looking directly into this thing. I just some people can be lucky because you can have these pockets of pristine gas even a bit closer than the very very very early universe which kind of starts to form stars so one could be lucky and find something a bit more closer but realistically

[00:20:38] speaking the higher the chances at the very early stages when the universe was more and more metal poor so that would be like there are few candidates that have come up in the last few months but nothing has been confirmed yet because it is kind of really hard even with JWSP to get spectra of these very very early systems and then also to convincingly say there is no other metals in these galaxies galaxies or like even stellar clusters

[00:21:07] in this epoch So does that mean we're pushing the epoch of reunisation closer to the cosmic microwave background 380,000 years? Yes so the reunisation roughly starts around Recius 10 or so 12 maybe and then ends up around Recius 6 so we know everything about reunisation should have finished in the first billion years of the universe or so but the question of course remains is what type of galaxies or what type of stars kind of led the reunisation and also when did the first stars and galaxies

[00:21:37] form so mapping that window from the CMB to end of reunisation is kind of active research that JWSP would be able to do because it will be able to probe the actually it is probing these early galaxies and especially going into much more fainter systems because the fainter systems we do expect to be also to be younger because these are the young things that are kind of developing fast so by doing so we are kind of looking into the more lower metallicity systems but the problem of course is

[00:22:06] also that these massive stars which is called population 3 stars would also only live for a very very short time period like maybe like 1 to 2 million years so if you want to find something within that very short time scale you have to be extremely lucky because what will happen after it explodes after a few million years when it explodes is that it will kind of pollute the medium around these star clusters with metal so then you kind of lose the ability to quickly track this first generation of stars and you want population 2

[00:22:36] stars you can find those in the outer reaches of our own galaxy yes we have quite a few of that and there are like very very low metal stars so there are programs even in Australia which is trying to map our Milky Way to find the remnants of population 3 stars because if you are lucky like you would have like very small mass population 3 stars in our galaxy but because they have formed like in the very early universe but because they are small they live for a long time so there's a possibility that there might be

[00:23:06] very very very low metal stars in our own Milky Way I think we found like quite about 10 to the minus 5 so it's kind of very low metalicity but it's not still a inflation 3 definition but of course that is a quite different regime of population 3 stars we are looking in the early universe that's the Mia Naniyakara from Swinburne University and this is space time still to come NASA's Juno spacecraft forced to enter a safe mode following a sudden onboard anomaly and later in the science report a new

[00:23:35] study has shown that the German delicacy sauerkraut is good for your gut health all that and more still to come on space time NASA's Juno spacecraft has been forced to enter its safe mode after suffering an unexpected anomaly the solar

[00:24:05] powered probe went into safe mode twice on April the 4th while doing one of its close flybys of Jupiter safe mode is a precautionary default status the spacecraft enters when it detects an internal systems problem not essential functions are then suspended and the spacecraft focuses on key operational tasks like communicating with the earth and power management upon entering safe mode Juno's science instruments were all powered down as designed for the remainder of the flyby the mission operations team re-established

[00:24:35] high rate data transmission with the spacecraft and Juno's currently conducting flyby software diagnostics mission managers are still working to transmit the engineering and science data that was collected both before and after the safe mode events Juno first entered safe mode about an hour before its 71st close approach to the gas giant known as Perijove it then went into safe mode again 45 minutes following Perijove during both safe mode events the spacecraft performed exactly as designed

[00:25:04] rebooting its computer turning off non-essential functions and pointing its antenna towards the earth for communications of all the planets in our solar system Jupiter is home to the most hostile environment radiation belts closest to the planet being the most intense Juno's long highly elongated orbit around Jupiter is designed to try and squeeze through the radiation belts with the least amount of interference early indications suggest the two Perijove 71 safe mode events occurred as the spacecraft flew

[00:25:34] through these belts to block high energy particles from impacting sensitive electronics to mitigate the harmful effects of the radiation Juno is equipped with a titanium radiation vault where its most delicate electronics are kept now including the Perijove 71 events Juno has unexpectedly entered safe mode on four occasions since arriving at Jupiter the first in July 2016 during its second orbit and then again in 2022 during its 39th orbit in all four cases

[00:26:03] the spacecraft performed as expected and recovered full capabilities Juno's next Perijove will be on May the 7th and it will include another flyby the Jovan volcanic moon Io at a distance of about 89,000 kilometers this is space time

[00:26:19] and time now to take a brief look at some of the other stories making news in science this week with the science report a new study has shown that the German delicacy sauerkraut is good for gut health a report in the journal applied in environmental microbiology

[00:26:48] shows that fermented German cabbage protects gut function which is an essential part of overall health supporting digestion and protecting against illness researchers were testing whether sauerkraut's nutrients could help protect intestinal cells from inflammation related damage the study compared raw cabbage sauerkraut and the liquid brine left behind from the fermentation process the sauerkraut samples included both store-bought products and fermented cabbage made in the lab they found that sauerkraut helped maintain

[00:27:18] the integrity of intestinal cells while raw cabbage and brine did not chemical analysis shows the fermentation changes cabbage's nutritional profile increasing beneficial metabolites such as lactic acid amino acids and plant-based chemicals linked to gut health these changes may explain why fermented foods are often associated with digestive benefits the authors also found there was no real noticeable difference between grocery store-bought sauerkraut and the lab-made version

[00:27:47] a new study has shown that lunar dust could one day be used to make solar panels on the moon the findings reported in the journal device could allow astronauts to access power on the moon without needing to transport heavy equipment from earth scientists created a substance designed to simulate moon dust and they then melted it into glass using it to build a solar cell the authors say the lunar solar cell could be more efficient in space than ones made from earth materials now they admit there's still a lot of hurdles to jump in order to see

[00:28:16] whether moon glass production processes would work in the lower lunar gravity environment and they hope to get their project onto the moon one day in order to test to see if it's viable for those of you who have spent some time in Darwin or really anywhere on Australia's top end the term mango madness is nothing new it refers to higher rates of anxiety stress and hostility combined with fewer hours of sleep reduced appetite and lower energy levels during the heat and humidity of the northern Australian monsoonal build-up

[00:28:46] now a new study reported in the journal Nature Climate Change claims that rising temperatures across Australia could increase the burden of mental and behavioral disorders by almost 50% by the year 2050 research from the University of Adelaide aims to highlight the urgent need to act now to protect mental health as the planet's climate warms in what most scientists would regard as proof that the law is an ass the Indian Supreme Court has ruled that the pseudoscience of astrology

[00:29:15] is a real science and that's despite there being hundreds maybe even thousands of irrefutable scientifically proven studies showing beyond doubt that this is simply not the case Tim Mendham from Australian Skeptic says the United States went through the same trauma in its now infamous monkey trial which looked at teaching creationism as a science in American schools astrology has a very strong following in India if you go to the positions vacant parts of Indian newspapers you'll find this list of people who are available

[00:29:45] from arranged marriages there's often women being promoted by their families as a lawyer 25 attractive Aquarius and they almost inevitably say what the star sign is and they try and match people up with a prospective husband or wife or whatever the case is with their star sign so astrology has a big influence like a lot of other pseudosciences in India quite frankly and the trouble is we're there is they're getting the imprimatur of the universities and the government the BJP government the BJP party is particularly fond of traditional Indian science

[00:30:15] which we would call pseudoscience therefore this thing about astrology came up and they went through a court case and the Supreme Court of India decided to rule that yes astrology is a science now the interesting thing is what they used to define science and to define astrology was that they used the Encyclopedia Britannica and they used Webster's Dictionary the problem was that the Encyclopedia Britannica was dated 1783 I think it was the second edition or something and the Webster's was pretty much as old as that as well so they are using pre-scientific if you like definitions

[00:30:44] of what astrology was what does that say about the Indian court system it says a lot about the Indian court system it also says a lot about their library they had a copy of 1700 Encyclopedia Britannica to pull down surely someone would have noticed it's a bit dusky and said maybe we should find a more recent one in fact the earlier edition of Encyclopedia Britannica that was the second edition the first one says it's absolute astrology is rubbish so they managed to get the one that actually was a bit softer they also used the rather strange logic that because astrology

[00:31:13] relies on astronomy which it does and ignore anyone who tells you that astrology came first it did not you can't do astrology without astronomy astronomers find out whether the planets are astrology decides what they mean so because astrology came out of astronomy and astronomy is science therefore astrology must be science as well now that false logic has a name in sceptical circles doesn't it yeah I think it's called stupidity okay the logical fault here is that it's the resort to authority right and the trouble is you have to make sure you have to make sure what your authority is if your authority

[00:31:43] is dated from 250 years ago you should probably rethink your authority you can't just say it's true because that person way back then said it was true that's Tim Mendham from Australian sceptics and that's the show for now space time is available every Monday

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