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Jason Snell for Yahoo
November 20, 2015 10:18 AM PT
This Week in Space: Supernova reruns, baby planets, and Mars weather ↦
As a kid, I always found it disappointing to turn on my favorite TV show only to discover it was an episode I’d already seen. Nobody likes reruns. Except for astronomers using the Hubble Space telescope: They’re waiting for the biggest repeat performance in the universe: a supernova.