One of the brightest stars in the sky will go dark next week in an 'extremely rare' event, astronomers report — and it will be visible in parts of the US.Betelgeuse, the orange-red outlier among the stars that make up the constellation Orion, will seemingly disappear for 12 seconds this Monday night, December 11, when it is briefly blocked by an asteroid.While asteroids pass between Earth and the stars all the time, the rarity of Monday's event stems from the asteroid, 319 Leona, hitting a sweet spot that will leave a 'ring of fire' visible around Betelgeuse.
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