If we restrict ourselves to looking for extraterrestrial life on Earth-like worlds, we might miss it entirely.
If science has taught us anything, it's that we shouldn't assume we know the answer before doing the key experiments or making the critical observations. Yes, we have to look where the evidence points, but we also have to look in places where we might think it's unlikely for life to arise, thrive, or otherwise sustain itself.
And perhaps most surprisingly, we thought that complex life could never survive in the harsh environment of space. But the tardigrade proved us wrong, entering a state of suspended animation in the vacuum of space, and successfully rehydrating when returned to Earth. Sure, we might look at the most common class of star out there in the Universe — red dwarf stars, which make up 75-80% of all stars — and come up with all sorts of reasons why life is unlikely to exist there. Here are just a few:
And that the lack of higher-energy light would make photosynthesis impossible, preventing primitive life from coming into existence. Perhaps exomoons orbiting large planets are even more conducive to life originating than a world like Earth is.
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