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I wanted to try my hand at a tidally locked planet. It orbits a dim red star near the outer edge of it's habitable zone. It's a super-earth, three times the mass of Earth, and one side of it's surface always faces it's star. The star-side is a massive, kilometers deep ocean while the opposite side is frozen. Despite the massive amounts of water this planet harbors no life--not even microbes--due to the floor of the ocean being locked in a deep layer of "hot ice," a kind of ice formed from the pressure at that depth.
2600x1910px 1.6 MB
Adobe Photoshop CS6 (Windows)
I see no reason it wouldn't be possible for life to develop on a tidally locked world. Not on ones like this, perhaps, where half the planet is cold enough to be locked in ice, but there are other possibilities. On such a world weather patterns would be different than ours with wind constantly blowing from the warm light side to the cold dark side, and the same would likely be true of ocean currents. Warm water would be carried from the light side to the dark side and back, making both halves roughly the same in terms of average surface temperature. On one side you would have a rich biosphere with access to non-stop sunlight on which to power itself while on the other you would likely have a far more competitive, limited biosphere locked in eternal night. Along the terminator (where the light and dark sides meet) you would have a strange land of eternal twilight and brutal weather patterns where life would struggle, but likely still find a way to thrive.
h-a-n-hStudent Interface Designer
i think life would be of course very very different from the way too fragile organisms on earth! The need to be adapted to very violent storms and currents, but maybe they can use them for their advance? that would be very interesting to see. Maybe they will fly and charge up on energy on the star-facing side and do something else (sleep?) on the other side until they fly around again.