Neptune was discovered in 1846. In 2010, astronomers observe as the farthest planet from the sun (sorry, Pluto) completes its first full solar orbit since then, a journey of some 17 billion miles.
JPL/NASA
Neptune was discovered in 1846. In 2010, astronomers observe as the farthest planet from the sun (sorry, Pluto) completes its first full solar orbit since then, a journey of some 17 billion miles.
JPL/NASA
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