ROBERT GENDLER & JIM MISTI / SCIENCE PHOTO LIBRARY ROBERT GENDLER & JIM MISTI / SCIENCE PHOTO LIBRARY
Spiral galaxy NGC 2403. This galaxy lies around 11 million light years from Earth in the constellation Camelopardalis. In 2004 a supernova was seen in this galaxy, the closest to Earth that had been recorded in over a decade. A supernova is the explosive death of a massive star. As the light emission pattern from supernovae is well understood, study of distant supernovae can be used to gauge distances and aid cosmological understanding.
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