YouSaid · the spoken record
Sara Seager
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- 135
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- 2020-08-16
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- 2020-08-16
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“Yes, and it would be hard because the planet is so faint. But with the star out of the way, the glare of that bright, bright, bright star, with that out of the way, then it becomes a much more manageable task.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Yeah, noise. And so this starshade, it's like a mathematical solution to the problem of diffraction. It's called. And this is what the first person who thought about starshade in the 1960s worked out, the mathematical shape, or one family of solutions. And the idea is that when the star shade, this very special shape like a giant flower with petals, when it blocks out the light, The light bends around the edges but interacts with itself in a way to give you a very, very dark image. It would be like throwing a pebble in a pond. Instead of getting ripples, the pond would be perfectly smooth, like incredibly smooth to one part in 10 billion, and all the waves would be on the outer edges, far away from where you dropped that pedal.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“I can tell you it turns out that if you block out a star, imagine blocking out a star with a circularly or a square-shaped screen. You wouldn't actually be blocking it because the star acts like a wave. The starlight can act like a wave, and it would actually bend around the edges of the screen. And so instead of blocking out the light, you're expecting to see nothing, you would see ripples. And the analogy that I love to give is like throwing a pebble in a pond. You get those ripples, you get these concentric ripples and they go out. And light would do something quite similar. You'd actually see ripples of light. And those ripples of light, they're actually way brighter than the planet we'd be looking for. So”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Yeah, we had this analogy like asking a friend to hold up a dime five miles away. Perfectly, like at the perfect line of sight with you.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“You're effectively blocking out the SAR. That you can see the planet directly. And Starshade would have a spacecraft attached to it and it would fly in space far away from Earth's gravity. And it would have to formation fly with a space telescope. So the ideas that Starshade blocks out the starlight in a very careful way and has to block that starlight out so that the planet, that is ten billion times fainter than the star, that only the planet light goes to the telescope.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Imagine that and revisited every decade until now when we think we can actually build it. And Starshade is a giant specially shaped screen. It is about, there's different versions of it, but think about 30 meters in diameter”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Right. And you know what's interesting is what it is first off. So, what's amazing about Starshade is it was first conceived of in the 1960s.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Well, first of all, we want to find the planets like Earth first, like just even finding those Earth-like planets is a billion dollar endeavor, billions of dollars endeavor And that's so hard because an earth is so small, so less massive, and so faint compared to our sun. It's the proverbial needle in a haystack, but worse, and we need very sophisticated space based telescopes to be able to find these planets and to look at them and see which ones have water and which ones have signs of life on them.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“But yeah, the multi generational ships, I mean, when you think about where we're headed as a species, maybe we don't send people. Maybe we end up sending. Raw biological materials and instructions to print out. Humans. It sounds kind of far fetched, but already we're printing liver cells in the lab and beating heart cells. We're starting to reconstruct Body parts. I mean, the thing is, it is so hard to get to another planet that this thought of printing humans or printing life forms actually could be easier.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Wow, it is very hard. I mean, our nearest, call it Earth mass planet, it's orbiting a star very different from our own sun, an M dwarf star, a small red star, Proxima Centauri. It's over four light years away. And we can't travel at the speed of light. We can't even travel. I mean, it would take tens of thousands of years to get there with conventional methods. So, you know, the movies? Multiderial, yeah, this movie Passenger, have you seen that movie Passenger? About a big spaceship that is traveling to another planet and everyone's hibernating. I won't give you the spoiler alert because one person wakes up and then it's kind of a problem”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“I'm convinced there will be something interesting. I just don't know what it is yet. But I don't think having some commercial value or value in the metric of something useful is really what's motivating us.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Human mostly. I think it's such in our desire to explore. Part of what it means to be human. So wanting to go to another planet and be able to live there for some time, it's just what it means to be human. Oftentimes in science and engineering, big, huge discoveries are made when we didn't intend to. So often this kind of pure exploratory type of research or this pure exploration research, it can lead to something really important, like the laser. We couldn't really live without that now at the grocery, you scan your foods, there's surgery that involves lasers. GPS, we all use our GPS. We don't have GPS because someone thought, hey, it would be great to have a navigation system. And so I do support, I do, I just, but I really think it comes primarily just from the desire to explore.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“SpaceX and other so-called commercial companies are only good news for my field because they're lowering the cost of getting to space by having reusable rockets. It's just been, it's incredible. And we need cheaper access to space. So from a very practical viewpoint, it's all good. About getting people, there's this dream that we have to go to Mars, boots on Mars”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“In a level of uncertainty, if we think of an Earth-like planet, Being an earth around a sun in the same orbit. Earth like planet being an Earth sized planet in an Earth-like orbit about a sun-like star, we're not there yet. We're not able to detect enough of those to give you a hard number. Some people have extrapolated, and they will say as many as one in five stars like our sun could be hosting a true Earth-like planet.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Well, there's other thoughts too, though. These big planets that are really close to the star, we think they formed far away from the star where there's enough material to form, and they migrated inwards. And some of these planets migrating inwards due to interaction with other planets or with the disk itself, they may have cleared it out. Kicked other planets out of the system. So there's a lot of ideas floating around. We're not entirely sure”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“We don't have that number yet per se. You know, we're not really there, but some people think that there's many planets per star. There's this analogy of Filling the coffee cup. Like, you know, you don't usually just pour one drop, you fill it, and that planetary systems, we see stars being born that have a disk of gas and dust. And that ultimately forms planets. So the idea, this kind of concept is that planets, so many planets form too many. And eventually some get kicked out and you're left with like a full planetary system, a dynamically full system. And so there have to be a lot because so many forms and a bunch survive.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Honestly, the numbers are probably like billions of trillions. Yeah, you know, in the UK, I think, I don't know if we do that here, but they will call a billion trillion where you put like one billion fold by a trillion. It's kind of weird. But here, I don't even know how to say the number 10 to the 20. Like, if you know what that is, that's one followed by 20 zeros. That's the big number.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“The woman could never have kids. They were older, but they didn't have kids, which for them was a real source of regret. But it was because the aliens who had abducted her had made it so that she couldn't have kids. And she had apparently something implanted behind her ear, which was somehow unimplanted later. And they were just so sincere. And they're such a lovely couple. And they just wanted to share their story.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Did you ever watch the show called The X Files? Scully and And what I love, actually, I used to put it up during my talks, my public talks. There's a picture of a UFO or what looks like UFO, and it says, I want to believe. So that's where I think a lot of us are coming from. I want to believe. And it's so great. And one time I put that up in this very, very nice couple approached me really nervous afterwards. And I said, hey, can we take you out for lunch sometime? And I said, sure. And they were like the nicest people. And just one of many who has an alien abduction story.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“We're not smart enough, we're good enough, not we are not me or not you, but whoever to cover it up. It just, it's sort of a myth.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Right. Okay. I got. I have a funny thing to tell you about that. So one of my colleagues had a really good answer to that. And it's not me saying this, so I can say this. But he said, look, he works with NASA, not at NASA. He works with government, not in the government. It's kind of mean, but he'd say, trust me, they couldn't hide it if they tried. Do you know what I'm saying? Like.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“It's so true when we don't understand consciousness. It's true, we don't understand how biology is hard, you know, unpacking it and working it all out. It's a stretch. And they say too that our thinking mind is like the tip of a pyramid, that everything else is happening under the hood. And what is happening? But the thing with, so the typical scientist response to, you know, are there aliens here is that we need to see major evidence, not like a sketchy picture of something. Need some cold hard evidence, and we just don't have that.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“I still but like you, I'm still enamored with the point that it is out there and that people believe so strongly and that so many people out there. Believe.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Don't really follow it, they follow me. I'd say Because in this field, if you're a scientist of any kind, you get. People contact us me. There's a lot of them about. Hey, I have stuff you should see. Hey, the aliens are already here. I need to tell you about it. And I know there are people out there who really believe.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“I know. But we are because in a way we're destroying our entire planet. But it's humbling to think that from far away. People probably can't even tell”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Well, let's zoom out again and think about oxygen. So when cyanobacteria arose like billions of years ago and figured out how to harness the energy of the sun for photosynthesis, they re-engineered the entire atmosphere. Twenty percent of the atmosphere has oxygen now. Like, that is a huge scale. You know, they almost poisoned everything else. Imagine, so are we doing anything at that scale? Like, are we changing anything at like 20% of the Earth with a giant structure or 20% of this or 20% of that? Like, we aren't actually.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“We do. We have the Voyager, but they're not really going anywhere in particular, and they're moving very, very slowly on a cosmic scale.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Yes, it is. But the funny thing is if no one's sending us a message, if everybody's only listening, how do you make progress?”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“We haven't sent one, they call that MEDI messaging. And there's a big kind of fear over Medi because you want to tell them you're here. It's kind of this like let's wait till they call us.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“I still love Setty, search for extraterrestrial intelligence. I like to hope that if there is a civilization out there, they're trying to send us a message. I think about it. I don't know, what are your thoughts? Like if you think about our Earth, there's no structure we've built that intelligent civilizations could see from far away. There's literally nothing, not even the Great Wall of China. And so to think like, why would this other civilization build a giant structure that we could see?”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“My dog is so funny. He's the golden doodle. His name's Leo. We joke that he's either a really dumb dog. And sorry, he's not here to defend himself, but he's either really dumb or he's a super genius, just pretending to be dumb.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“The life is out there somewhere. The huge numbers of stars and planets. I like to think that life had a chance to evolve to be intelligent. I'm not convinced the life is anywhere near here, only because If it's hard for intelligent life to evolve, then it will be far away by definition.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Yeah, the dream, yes, the dream condition is that life is super abundant and it's based on The thought that if there is a planet with water, Continents that it also has the ingredients for life. And that the kind of base. Base kernel thought is that if the ingredients for life is there, life will form.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“It does, but you know, there's not an infinite number of liquids. There's maybe like five liquids that can exist inside or on the surface of a planet. And water is the one that exists for the largest range of temperatures and pressures. And it's also the easiest type of planet for us to find and study is one with water vapor, rather than a cold planet that has ethane and methane lakes.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Because it's not intuitive in any way, but water is broken up by ultraviolet radiation from the star or from the sun. And on most planets, when water is broken up into HNO, the H the hydrogen will escape to space. Because just like when you think of a child letting go of a helium-filled balloon, it's... Floats upwards, and hydrogen is a light gas and will leave from Earth from the planet. So ultimately, if you have water, unless there's an ocean, like a way to keep replenishing water vapor in the atmosphere, that water vapor should be destroyed by ultraviolet radiation.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“We have some really cold liquids, like almost gasoline, like ethane and methane lakes that have been found on one of Saturn's moons, Titan. That's so cold, though. And for exoplanets, we can't study really cold planets because they're just simply too dark and too cold. So we usually are just left with looking for planets with liquid water. And to your point, you remember, as we talked about how planets are less than a pixel in that way to say. So we can't see oceans on a planet. We're not going to see continents and oceans not yet anyway. But we can see gases in the atmosphere. And if it's a small rocky planet, and this is going into some more detail, If we see a small rocky planet with water vapor in the atmosphere, we're pretty sure that means there has to be a liquid water reservoir.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Okay, so all life on Earth needs liquid water. And so there's been this idea in astronomy or astrobiology for a long time called follow the water, find water. That will give you a chance of finding life. But we could still zoom out and the kind of the community consensus is that we need some kind of liquid for life to originate and to survive because molecules have to react. If you don't have a way that molecules can interact with each other, you can't really make anything. And so when we think of all the liquids out there, water is the most abundant liquid in terms of planetary materials. There really aren't that many liquids. Like I mentioned liquid rock.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Well, one thought, and this is more when we want to be rather than might be, is that these so-called mini-Neptunes, we call them, that they are waterworlds, that they could be scaled up versions of Jupiter's icy moons, such that they are planets that are made of more than half of water by mass”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Way too hot. The molecules for life would just be molecules needed for life just wouldn't be able to survive those temperatures. We have some other planets. One of the most mysterious things out there, factoid, if you will, is that the most common type of planet we know about so far is a planet that's in between Earth and Neptune size. It's two to three times the size of Earth. Have no solar system counterpart of that planet Is like going outside to the forest and finding some kind of creature or animal that just no one has ever seen before. And then discovering that is the most common thing out there. And so we're not even sure what they are. We have a lot of thoughts as to the different types of planet it could be that people don't really know”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“We think the surface is hot enough to melt rock. So instead of running out by the bay or the river, you'll have like liquid lava. There would be liquid lava lakes on these planets, we think.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“For example, there could be a Jupiter size planet where an Earth should be. We find planets that are the same size as Earth but are orbiting way closer to their star than Mercury is to our Sun. So close that, because close to a star means they also orbit faster. And some of these hot super-Earths we call them, their year, their time to go around their star is less than a day. They're heated so much by their star. They're heated so much by the star.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Right, right. So we're not at Earth like planets yet. All the planets we're finding are so different from what we have in our solar system. They're just easier planets to find.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Exactly. They can discover something. And in fact, the NASA policy for this mission is that all the data becomes public as soon as possible. So anyone could act. It's not as easy as it sounds, though, to download the data and look for planets. But there is a group called planethunters.org, and they take the data and they actually crowdsource it out to people to look for planets. Yeah, and they often find signals that our computers and our team missed.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“And so, to find transiting planets, we look at a big part of the sky at once, or we look at tens of thousands or hundreds of thousands, or even in some cases, millions of stars at one time. And so, you know, you're not going to do this by hand going through a million stars, counting up the brightness. So we have computer software and computer code that does the job for us and looks for a, you know, counts the brightness and looks for a signal that could be due to a transiting planet. And I just finished a job called Deputy Science Director for the MIT-led NASA mission test. And it was my... View to make sure that we got the planet candidates, the transiting light curves out to the community so people could follow them up and figure out if they're actual planets or false positives.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“So for exoplanets, you want to think about it as like a pixel or less than a pixel. We're not getting any information. To be more technical, our telescope spreads the light out over many pixels, but we're not getting information. We're not tiling the planet with pixels. It's just like a point of light, or in most cases, we don't even see the planet itself, just the planet's effect on the star. But another thing that really helped was computers because transiting planets are actually quite rare. I mean, they don't all go in front of their star.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Kind of telescope. So on the ground, people are using telescopes, small telescopes that are almost just like a glorified telephoto lens. And they're looking at big swaths of the sky. And from the ground, people can find giant planets like the size of Jupiter. So it's about 10 to 12 times the size of Earth. We can find big planets because we can reach about 1% precision. So not sure how technical you want to get, but...”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“And so one thing that really helped exoplanets were detectors that were very sensitive. Because when we're looking for the transiting planets, what we're doing is we're monitoring a star's brightness as a function of time. It's like click taking a picture of the stars every few seconds or minutes. And we're measuring the brightness of a star, like every frame. And we're looking for a drop in brightness that's characteristic of a planet going in front of the star and then finishing its so-called transit. To make that measurement, we have to have precise detectors.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“Yeah, legitimate field increase. And what's helped us is everything that's helped everyone else. It's software. It's computers. It's hardware. It's like our phones. You have a fantastic detector in there. Like they didn't always have that. I don't know if you remember the so-called olden days. We didn't have digital cameras. We had film. You take a film camera, you send the film away, and eventually it comes back. And then you see your pictures. And they could all be horrible.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“So before when I started an exoplanets, it was still sketchy. Like, it wasn't considered a career or a thing, a place where you should be investing And right now, today, so many people are working in this field, a good, I don't know, at least a thousand, probably more. I don't know if that sounds like a lot to you, but it's a lot.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source
“I can say that, but I'd like to just say something else first, so in exoplanets, you know, the line between what is considered completely crazy and what is considered mainstream research legit. It's constantly shifting.”
2020-08-16 · Lex Fridman Podcast · #116 – Sara Seager: Search for Planets and Life Outside Our Solar System · IDENTIFIED FROM THE TRANSCRIPT · source