Calling them Eyeball planets — a tidally locked planet with one side always facing the sun — Nautilus explains that any life-bearing worlds being discovered now will probably look nothing like planet Earth.
Where on a hot eyeball planet could you live? It’s a classic Goldilocks story. The day side is roasting and dry. The night side is frigid and icy. In between, it’s just right! The sweet spot—let’s call it the “ring of life”—is at the terminator, the boundary between night and day. The ring of life is bounded by deserts on one side and ice on the other. There is a constant flow of water from the night side to the day side—a series of rivers, all flowing in the same direction. The Sun is fixed in the sky right at the horizon, and the area is in permanent light. Conditions are pretty much the same all the way across the ring of life. One can imagine vegetation following the rivers onto the day side until they dry up, with different ecosystems interspersed along the way. There could be mountains at the edge of the ice sheets, since the ice-covered continents would be heavily weighed down.
Above, an image of an Eyeball planet from the Wikipedia page.
Also, of interest, Universe Today reports that the giant planets of our solar system student Mars' growth.
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