The cooling remnants of the supernova Cassiopeia A, as shown by a long exposure with NASA's Spitzer Space Telescope. Credit: NASA/JPL-Caltech/Univ. of Minn.
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The cooling remnants of the supernova Cassiopeia A, as shown by a long exposure with NASA's Spitzer Space Telescope. Credit: NASA/JPL-Caltech/Univ. of Minn. |
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