Joel 2:30-31 says it will go blood red before the day of the Lord.
Now It's Certain: The Supergiant Star Betelgeuse WILL Explode
Posted by Cristian AntonescuBack in December last year, astronomers have been suspecting that the supergiant red star Betelgeuse is about to explode. The cosmic object has become much dimmer in the recent months, even though it was among the brightest stars in the night sky. Being located in the Orion constellation, Betelgeuse will finally face its end and turn into a supernova. It's not a matter of "if" anymore, according to the latest data gathered by LIGO, the Laser Interferometer Gravitational-Wave Observatory.
Thus, gravitational waves coming from Orion's direction have been detected by LIGO. Such an event can be caused by a supernova, and as you might have already guessed, the astronomers are placing their bets on Betelgeuse's explosion.
Betelgeuse's explosion could occur in the next several weeks
This is one hypothesis claimed by scientists, and among them is Edward Guinan, a professor at Villanova University's Department of Astronomy and Astrophysics. His university has been examining Betelgeuse since almost four decades ago, so he might know what he's talking about. However, it's also possible that Betelgeuse will explode much later, when humanity will be fully extinct.
What's for sure is that the supergiant star will indeed explode, but we're not sure exactly when it will happen. When it does, the supernova will be visible with the naked eye for months since it will be as bright as several stars on the night sky...