Newly Discovered Exoplanet Has Longest Known Year
( 01:08 )
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Astronomers from the Harvard-Smithsonian Center for Astrophysics have found an exoplanet with the longest year using data taken from the NASA Kepler spacecraft. The exoplanet, known as Kepler-421b, orbits its star about one thousand light years away from Earth every 704 days, at an estimated distance of 110 million miles away from the host star.

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