Doomed supergiant star Betelgeuse has been acting strange lately, appearing far less bright than usual and then bouncing back to normal. Hubble Space Telescope observations from last year suggest the unexpected dimming was caused by a sudden ejection of hot gases, which formed an enormous dust cloud after cooling.
An unusually bright star in a nearby galaxy has gone missing, in a mystery of cosmic proportions.
Back in 2016, a telescope spotted a supernova flaring so brightly that it far outshone its own galaxy. The exploded star continued emitting radiation for more than 1,000 days, unleashing more energy than any supernova previously documented. But that’s only the start of the story.