Interstellar Medium Near Cassiopeia A
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Space photo of the week: James Webb telescope reveals mysterious 'light echo' in the broken heart of Cassiopeia

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Images from the James Webb Space Telescope (JWST) show glowing interstellar medium — gas and dust that fill up the space between stars — near the supernova remnant Cassiopeia A.
The light from this supernova is believed to have reached Earth in the 1660s .
These images reveal a fascinating phenomenon known as a light echo — faint reflections of the light emitted during a supernova explosion.
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