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Alien Night Sky
24" x 18"
Photographic Print

Alien night sky Artwork of a large spiral galaxy moons planets one at upper right stars and a comet upper centre in the night sky of an alien extrasolar planet This planet has oceans of liquid water and clouds of water vapour If a planet is to have a surface temperature suitable for liquid water and to retain an atmosphere it must be a suitable size and distance from its star on horizon lower left The number of habitable planets in the Milky Way galaxy is not known but has been estimated at anything between just Earth and as many as billion Many planets have already been discovered orbiting nearby stars