GARY TONGE / SCIENCE PHOTO LIBRARY GARY TONGE / SCIENCE PHOTO LIBRARY
Alien planetary and stellar system. Illustration of extrasolar planets orbiting a distant star, with streamers of glowing gas and dust. Exoplanets so far discovered range from very large gas giant planets to rocky planets of various sizes. Hundreds of alien planets have been detected, and their planetary systems studied, with many thousands more not yet confirmed.
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