Trappist-1e is, in my opinion, the best candidate for extraterrestrial life we know of. Unlike Trappist-1d, it is actually denser than Earth. This is great news, because the problem with other planets in the Trappist-1 system, such as Trappist-1d, is that they are not very dense, implying that they have ridiculous amounts of their mass in water. Trappist-1e, however, is thought to have an amount of water similar to that of Earth. This means it most likely isn't a complete water world. (If it is, it's probably a shallow one) It most likely has a solid, rocky surface, with at least some water on it. I'm not going to jump to conclusions about whether or not Trappist-1e has life on it though. Yes, this planet could be habitable, but just because a planet is habitable doesn't mean it is inhabited. But if it does have life on it, I think it is probable that Trappist-1d does as well. This is because considering how close to each other the planets in this system are, it is incr...
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Trapppist-1d, the third planet from the star, is where things start to get more interesting. This planet is in the inner part of its star's habitable zone and is a small, rocky planet similar to Earth, but about half the size; it is thought to have a somewhat Earth-like temperature and water on its surface. However, there is a very critical problem with possibility of Trappist-1d having life: It has a ridiculous amount of water. In fact, it is thought that up to 5% of its mass is water. That's more than enough to cover the planet in a world-wide ocean. If it is true that life can only arise in tidal pools, Trappist-1d cannot support life, unless it traveled there from another planet via panspermia. If life arises from hydrothermal vents, the chances of life on Trappist-1d increase, but there is still a problem. Once an ocean reaches a certain depth, the pressure becomes great enough to compress water into ice; this covers the seafloor in a layer of ice...
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Trappist-1c, the second planet from Trappist-1, is very similar to Trappist-1b. It's slightly smaller and further away from its star, but for the most part, it's about the same. It does seem at least a little less extreme, though. It is of course further from its star, which means it's most likely cooler, and it is thought that its atmosphere is less thick than that of Trappist-1b, but the chances of life existing on Trappist-1c are still very low.
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Trappist-1b is the closest planet to Trappist-1 and also probably the least likely to be inhabited by life. We know it is a rocky planet, and that it is very hot, most likely possessing a thick atmosphere like that of Venus, either made of carbon dioxide or water vapor, both of which are excellent greenhouse gasses. Basically it's like Venus only bigger, even hotter, and with an even thicker atmosphere.
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One of the most interesting star systems to me is Trappist-1. Basically it's a ridiculously small red dwarf star (about the size of Jupiter) with 7 planets around it. The reason I find it fascinating isn't because the individual planets but because of the individual planets but because of the nature of the system itself. A lot has happened since early 2017 when it was first discovered, and although there are certainly problems with the possibility of life on each of the planets, the fact that most of them have even a slight chance of bearing life adds up to something very interesting. For the elephant in the room, Trappist-1 is a red dwarf, which is usually bad. The star's habitable zone is EXTREMELY close to it. This is because it's about as cool as stars get. About 2,000 degrees. The reason this is so bad is because the closer you are to a star, the more radiation you'll be exposed to. But this is pretty much the only place in the Trappist-1 system where Earth-lik...