This stunning space wallpaper shows the youngest-known supernova remnant in our galaxy, which lies 10,000 light years away in the constellation Cassiopeia. The light from this exploding star first reached Earth in the 1600s.
(Image: © NASA and The Hubble Heritage Team (STScI/AURA) / Acknowledgment: R. Fesen (Dartmouth) and J. Morse (Univ. of Colorado))
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