Is there something that kills them? Well, they were killed some time ago, probably millions of years. Still, we believe that there is no such thing as the limitation period for the Universe.
The group of scientists is working hard to find an answer for this question. Still, we believe they already have the proper explanation. The killer always was absence of the gas.
Representatives from the Western Australian center ICRAR have found that there is a more potential danger in the pressure ram stripping that they have thought before. The pressure takes the gas from galaxies. And it forces them to die, without ability to create the stars anymore.
Researchers have studied closely 11 000 different galaxies. And every time they have received almost the same results. Gas was taken away from them, and they have died.
According to the main author of this research, Dr. Brown Toby, there are dark halos around different galaxies, which were formed from the clouds of dark matter. There is 27 percent of dark matter, and 5 percent of simple matter. The other 68 percent is dark cosmic energy.
He says that during the life of galaxy halos can be shaped in different sizes. However, when the galaxy is losing this dark matter protection around them, hot plasma pushes away the gas in stripping ram-pressure process.
Scientist believes it reminds him the work of a big broom that wants to sweep all the gas from every galaxy that does not have protection.