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Group Leader: | GKNYC |
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Founded: | March 16th, 2013 |
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Once in a Long While
Wallpaper Description:
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.Credit: NASA/Goddard