Signs in the Skies: Something Silent But Deadly Is Killing Galaxies
So, who’s the prime suspect in this crime? It’s none other than dark matter: the mysterious, invisible material thought to make up 27 percent of the universe. Turns out, it’s also quite the smooth criminal.
“As galaxies fall through these larger halos, the superheated intergalactic plasma between them removes their gas in a fast-acting process called ram-pressure stripping.”
The team’s research suggests that not only is ram-pressure stripping pretty common, it can happen to small and large galactic groups alike.
It’s a tragic tale, but it could be worse: some galaxies get strangled to death. It’s a cold universe out there, but no one said the final frontier was for the faint of heart.