NASA created this enhanced view of Mercury using images from the Messenger mission.
About 13 times each century, the closest planet to the sun passes between Earth and our star, treating us to a rare transit event. Your next chance to catch this astronomical wonder is Nov. 11. This won't happen again until 2032.
Why are these Mercury transits so rare? It has to do with the planet's highly eccentric orbit and how it meshes with Earth's orbit. Mercury's distance from the sun can vary quite a bit, and its orbit has an incline ...
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