We will certainly not be on Earth until 4.5 billion years from now to observe galaxy changes, but two NASA satellites could give us a picture of galaxy mergers.
At that point, the Milky Way begins to merge with the Andromeda Galaxy, and fortunately NASA satellites show an image of it.
ARP 299 is a fusion of two other galaxies, and NASA uses its Chandra X-ray telescope in conjunction with the Hubble Space Telescope to image the galaxy. Has registered.
According to NASA, ARP 299 is a unique combination of two other galaxies that have been merging for a long time. The speed at which galaxies move relative to other objects in space may change dramatically. But even though they are very fast, their integration may still take hundreds of millions or even billions of years.
In the case of ARP 299, it is not clear exactly when this merger took place or how long it lasted. The galaxy is about 134 million light-years from Earth, so our observations of this event are about 134 million years late. The two merged galaxies have certainly been involved for as long as human life.
Scientists have made various estimates about the duration of the merger of two galaxies after the collision, and there are many factors, including the “size of the galaxies” and the “angle of collision”, that affect the speed of this phenomenon. Although estimates vary, it is widely accepted that this process takes at least a few billion years.
Although galactic mergers may seem daunting, the stars within these systems are unlikely to collide. Some of them may affect each other due to gravity, but in general, stars and even planets are not greatly affected in the long run.