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Experts from the University of Tokyo have developed simulations of various scenarios to understand what happens when galaxies collide.
In the past, it was thought that when galaxies collided, the activity of massive black holes at their centers intensified as they received additional matter.
But the Japanese team says that in certain scenarios – that is, when a cactus is found – the galaxies run out of cosmic matter that a black hole in the center could enclose.
Space archaeologists studying the structure of stars in the trajectory of birds have evidence that this type of large-scale collision may have occurred about 11 billion years ago.
Although the researchers used a different model of the Milky Way in the study, lead author Yohei Miki told MailOnline that the activity of the massive black hole in the Milky Way is lower compared to black holes in other galaxies.
So it is likely that the black hole in the center of our galaxy, called Sagittarius A, was unsaturated by cosmic matter after a direct collision with another galaxy.
“When you think of a giant phenomenon like the collision of two galaxies, you want to imagine it as some kind of cosmic catastrophe in which stars collide and explode, and the scale of destruction is inconceivable,” said author Yohei Miki. “But in reality, this event is more like a confluence of two clouds, where the larger one” swallows “the smaller one.”
In this scenario, the stars in two galaxies are unlikely to collide, but the broader consequences of “cloud fusion” could be enormous.
Galaxies face each other differently – sometimes a small galaxy can interfere with a larger side and bend or merge completely. Either way, during this process, the two galaxies will exchange stars.
Galaxies can also meet a cactus. Then the smallest will be destroyed by the largest. It is in this case that the huge black hole runs out of material.
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