Monobiome worlds are an annoying staple of science fiction. Tatooine is not entirely infeasible (Look at Mars). Hoth might also be possible. But when that's all your characters visit...
And it seems that we may have found a world entirely covered with water.
TOI-1452b orbits one of two stars in a binary system about 100 light years away, and is slightly larger than Earth. It's in the Goldilocks zone.
And it's considerably less massive than it should be, which has led researchers to think it may be entirely covered by...water. Enceladus is also a water world, but being much further out, the ocean is frozen.
On TOI-1452b it would be liquid. Water may make up as much as 30% of its mass. James Webb may be able to test the hypothesis.
So, an entirely ocean covered planet. With two suns. Who might make that their home? There are plotbunnies resident for sure.
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