| | Itâs three times the mass of the Earth and a chilly 238 degrees below zero. The planet and its star are nearby in cosmic terms only: At 30 trillion miles from Earth, Barnardâs star is the closest single star to our solar system. The newly discovered planet is the second-closest known exoplanet to the Earth and orbits the fastest moving star in the night sky. Scientists announced its existence on Wednesday.
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