Most exoplanetary worlds are very far away, even Mars is currently very far away, but that can change, try to see a little perspective, human life is short, but even if it is short, if we see this in perspective of a century that within the scale of human life, it can fit within the memory of our ancestors, a century ago thinking about traveling to the Moon was something unimaginable for people, by the way, today we return to the Moon after 50 years, the launch. It was a success, a big one for those involved.
And there are 45 magnificent worlds, it has recently been published in a catalogue, the 45 worlds selected from the little more than 6000 exoplanets discovered to date, which would be in the habitable zone and which would have the possibility of having life or being habitable by perhaps a human colony that reached them, the researchers limited their list of planets to rocky planets, this is an important detail, they do not include aquatic worlds or oceanic worlds like the famous one. K218v, that tiny world K218B, which a little over a year ago, a biosignature was detected in its atmosphere.
Souce
A diagram depicting habitable zone boundaries across star type with rocky exoplanets
And by the way, when referring to an ocean planet, we are not talking about a planet like the Earth that has oceans, it is a planet that is globally covered by water, a large part of these worlds is made up of water, they are oceans, in principle, which can be more than 100 km deep, I say in principle because at certain pressures the water begins to behave in curious ways, so I tell you that no, it is a different composition, although with a tremendous amount of water, this does not mean that the water does not also have elements, materials that can promote the development of life in those worlds.
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