Zombie galaxy came back to life after 20 million years

A strange, zombie-like galaxy has been spotted in the distant universe. This undead galaxy stopped forming stars for 20 million years before coming back to life in a burst of activity, and it could help explain a cosmic mystery about the earliest galaxies.

“We’ve seen galaxies going through bursts of star formation, and we’ve also seen galaxies that are no longer forming stars, but this is the first instance of seeing a galaxy that’s stopped forming stars and then gone through this sort of rejuvenation process,” says …