DAVID A. HARDY / SCIENCE PHOTO LIBRARY DAVID A. HARDY / SCIENCE PHOTO LIBRARY
Alien planet. Artwork of a gas giant planet (purple) and two of its moons, seen from the surface of a third moon. One of the moons (centre right) resembles Earth. Several high-mass planets have been discovered by observing the gravitational effects of their orbits on the movements of the stars that they orbit.
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