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Kepler-69c

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1024px-Kepler-69c- Super-Venus

Artist's Conception of Kepler-69c as a Super-Earth

Kepler-69c (also known as KOI-172.02) is a confirmed super-Earth extrasolar planet, about 70% larger than Earth, orbiting a Sun-like G-type star located about 2,700 ly (830 pc) away from the solar system. The planet was discovered by NASA's Kepler spacecraft using the transit method. Kepler-69c is most likely a terrestrial planet. Although it was initially thought to be in the habitable zone, it is now thought to represent a super-Venus, analogous to Venus on a more massive scale, and thus highly unlikely to be habitable.

Terraforming could be a costly and lengthy process if the planet has anything like Venus' thick, sulfuric, CO2 atmosphere. If any water is present, it will most likely be within dense clouds. Though the possibility a hot, supercritical global ocean of water is not out of realm of possibility. Either way, drastic global cooling and reduction of atmospheric pressure would have to accomplished to make the planet even resemble Earth. Massive solar shades could help keep the planet cool from space, while high albedo cloud cover and buffer gases could keep the atmoshere at a comfortable temperature from the surface. Its surface gravity will be much stronger than Earth's, meaning only genetically engineered life forms and specially designed robotic drones could live pleasant lives there (one could predict that by the time interstellar travel is feasible, these technologies could easily exist).

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