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UFOs and aliens: Is life on other planets possible?

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You are here in the universe: on a rock with clouds and oceans and fire in its gut, orbiting a star in the outer suburbs of the Milky Way galaxy. As far as we know, nothing else beyond this rock is alive and chances are you haven’t left it. But our radio waves have.
Since humanity’s very first broadcasts hit the air one hundred-odd years ago, they have travelled more than one hundred light years (or roughly 900 trillion kilometres). They’ve reached other planets and other stars. Those within sixty light years of Earth would already know we have a space program. That is, if anything is out there listening. ....

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"Mount Everest Would Have Been Submerged" --Ancient Earth, One of the Milky Way's Countless Water Worlds

In 2016, astronomers using data from NASA’s Kepler mission, discovered a planet unlike anything in our solar system –a “water world” planetary system orbiting the star Kepler-62 –a five-planet system with two worlds in the habitable zone their surfaces completely covered by an endless global ocean with no land or mountains in sight.
“Utterly Different Worlds Than Earth”
“These are utterly different worlds compared to our own Earth,” said Harvard University astronomer Li Zeng in 2019 about the chances that water worlds are a common feature of the Milky Way, which was heightened by research using computer simulations showing that sub-Neptune-sized planets –planets featuring radii about two to four times that of Earth– are likely to be water worlds. Some of these planets, Zeng observed, have oceans deep enough to exert pressures equivalent to a million times our atmospheric surface pressure. Under those conditions, fluid water gets compressed in ....

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