Betelgeuse's bizarre dimming caused by eruption
All About Space|Issue 108
In the autumn of 2019, red giant Betelgeuse began dimming significantly, losing about two-thirds of its brightness by February.
Mike Wall

This dramatic dip spurred speculation that the star’s demise may have been imminent – perhaps just weeks away, from our perspective, anyway. Betelgeuse lies about 500 light years from Earth, so everything we’re seeing with the star today happened centuries ago.

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