Proxima d orbiting Proxima Centauri, illustration
Illustration showing Proxima d (right), an exoplanet candidate orbiting the red star Proxima Centauri (orange, left), the closest star to the Solar System. Proxima d has a mass a quarter of the Earth and is one of the lightest and exoplanets to be discovered. Exoplanets Proxima c and Proxima d, which also orbit Proxima Centauri, are also shown., by EUROPEAN SOUTHERN OBSERVATORY/SCIENCE PHOTO LIBRARY
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