SUMMARY: The Hubble Space Telescope captured this image of a supernova exploding in a relatively nearby galaxy. The star that became supernova SN 2004dj was probably 15 times the mass of our own Sun, but only 14 million years old - the larger the star, the shorter and more violent its life is. The star was located in a galaxy called NGC 2403, which is only 11 million light-years from Earth, so this makes it the closest supernova seen in more than a decade. Astronomers will continue to study SN 2004dj for years to understand how certain kinds of stars explode, and what chemicals they're made up of.
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