Aliens in the Skies on an Exoplanet
Artwork of flying or floating alien creatures above the clouds on a massive terrestrial planet. Very massive rocky planets are expected to have such dense atmospheres that life on the ground could be virtually impossible owing to the great pressure of the atmosphere. This illustration instead imagines that creates have evolved which are buoyant, never venturing to the ground., by MARK GARLICK/SCIENCE PHOTO LIBRARY
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