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Once in a Long While | Space Wallaper

Once in a Long While
Across a 100 year time frame, Mercury passes between Earth and our Sun only 13 or so times.
(Image: © NASA/Goddard)

About 13 times every 100 years, Mercury passes between Earth and the Sun. Planetary transits are rare events that offer a unique opportunity for astronomers to study how planets move in space. Here, Mercury is visible in the lower lefthand corner of the image. [More images of the Mercury Transit of 2016]

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