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This is what the star Betelgeuse exploding would look like from Earth.
— Wonder of Science (@wonderofscience) January 6, 2020
Credit: NHK/Cosmic Front pic.twitter.com/PHJha8NJld
The light from Betelgeuse is 640 years old. It may have already supernova-ed.
If it goes supernova today we can see it in 640 years.
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Betelgeuse has been grabbing a few headlines lately, as the normally bright star dimmed to its lowest point ever recorded — and astronomers don't exactly know why.
Now the U.S.-based Laser Interferometer Gravitational-Wave Observatory (LIGO) has detected a gravitational wave coming from that direction, adding another intriguing detail to what's happening.
The first gravitational wave ever recorded — a powerful ripple through space-time caused by cataclysmic events, like two merging black holes — was detected in September 2015.
https://www.cbc.ca/news/technology/betelgeuse-gravitational-wave-1.5433653
If Betelgeuse goes supernova, it will be as bright as the full moon and cast shadows on the Earth.