It is larger than any other rocky planet . The Voyager 1 spacecraft took this picture in 1990 from the outer Solar System . This rock is so large its gravity makes it nearly spherical, and holds heavy gases near its surface. Yesterday, this rock started another orbit around its parent star , for roughly the 5 billionth time, spinning over 350 times during each trip. Happy Gregorian Calendar New Year to all the human inhabitants of this rock we call Earth .
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