While Jupiter is blossoming with newly discovered moons, news comes about a galaxy that…well, you’d better read it. Nightmare warning, nightmare warning! (Laughter warning, too.)
Via 538 Significant Digits:
2 billion years ago
So our galaxy, called the Milky Way, used to have a big sister galaxy, called M32p, a nice elliptical galaxy with lots of young stars. Cool, right? But, get this, another damn galaxy ate it. The Andromeda Galaxy, sort of a jerk, as it turns out, devoured big sis about 2 billion years ago. To make matters worse, Andromeda is a serial galaxy killer, thought to have done the same to hundreds of other smaller but well-meaning galaxies over the years. [Space.com]