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Remnants of a Supernova

Photo: Colorful remains of an exploded star

This Hubble Space Telescope image shows debris from the massive Cassiopeia A supernova arranged into thousands of small, cooling knots of gas. Each clump, originally just a small fragment of the star, is tens of times larger than the diameter of our solar system.

Photograph courtesy NASA/Hubble Heritage Team (STScI/AURA)