Star-gazers gasped when they saw how much Betelgeuse dimmed in 2019 and the reason wasn't clear. Even though it's back up to full strength, how long will it be before it explodes? We haven't seen a supernova in over 400 years.
from HowStuffWorks - Learn How Everything Works! https://ift.tt/3n1YrBn
Wednesday, September 30, 2020
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