The researchers found that the farther away they are, the more chaotic, disordered movements occur in galaxies. The rotational speed, however, increased in closer galaxies. The most massive galaxies showed the highest degree of order.
"Most galaxies in the neighborhood of the Milky Way, where new stars are formed, form rotating disks, like the Milky Way itself or the Andromeda Galaxy, " Kassin says. "Such disk-shaped galaxies are well organized. There is a defined plane in which the galaxy lies, and most stars and clouds of gas rotate in the same direction around the center. Only a few stars do not move in circular orbits around the galactic center.
But eight billion years ago, things looked quite different, Kassin and her colleagues noted to their surprise. At that time, stars and gas clouds were still criss-crossing in many galaxies. Only gradually did the familiar order come to an end. The Milky Way was probably a much more chaotic place around the time the solar system was born. display
Earlier studies on the evolution of galaxies excluded messy representatives from the outset. So the researchers falsely came to the impression that the development of the Star Islands had been completed long ago. But in reality there are still clashes between small and large galaxies, though not as common as they were a few billion years ago. After two systems are merged, there is usually an explosion of new star births. Then it takes another billions of years, until the order gets through again.Susan Kassin (Nasa Goddard Space Flight Center, Greenbelt, Maryland) et al .: The Astrophysical Journal, Vol. 758, No. 2 doi: 10.1088 / 0004-637X / 758/2/106 © science.de - Ute Kehse