Before it exploded, Cassiopeia A’s layers of elements were stacked neatly (top), with the heaviest at the core and the lightest at the top. These layers were preserved when the star exploded (bottom). Credit: NASA/JPL-Caltech
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Before it exploded, Cassiopeia A’s layers of elements were stacked neatly (top), with the heaviest at the core and the lightest at the top. These layers were preserved when the star exploded (bottom). Credit: NASA/JPL-Caltech |
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