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Beta Pictoris - Measuring the Day
Wallpaper Description:
This space image is an artist's view showing the planet orbiting the young star Beta Pictoris. This exoplanet is the first to have its rotation rate measured. Its eight-hour day corresponds to an equatorial rotation speed of 100,000 kilometres/hour--much faster than any planet in the Solar System.Credit: ESO L. Calcada/N. Risinger (skysurvey.org)