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Contact: Patrick Farrell
pmfarrel@bu.edu
617-358-1185
Boston University Medical Center
Caption: This is an image of Mercury's tail obtained from combining a full day of data from a camera aboard the STEREO-A spacecraft. The reflected sunlight off the planet's surface results in a type of over-exposure that causes Mercury to appear much larger than its actual size. The tail-like structure extending anti-sunward from the planet is visible over several days and spans an angular size exceeding that of a full Moon in the night sky.
Credit: NASA/STEREO
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Related news release: Mercury found to have comet-like appearance by satellites looking at sun
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