In the early hours of Nov. 27, 2013, Comet ISON entered the field of
view of the European Space Agency/NASA Solar and Heliospheric
Observatory. In this picture, called a coronagraph, the bright light of
the sun itself is blocked so the structures around it are visible. The
comet is seen in the lower right; a giant cloud of solar material,
called a coronal mass ejection or CME, is seen billowing out under the
sun.
Comet ISON, which began its trip from the Oort cloud region of our
solar system, will reach its closest approach to the sun on Thanksgiving
Day, skimming just 730,000 miles above the sun's surface.
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