Group 10 Galaxies And Black Holes

Chandra X-Ray Observatory announced that it’s observed something unprecedented: a supermassive black hole being ejected from its own galaxy at speeds of millions of miles per hour. The evidence suggests that the ejection was caused when the black hole collided with the supermassive black hole of another galaxy, producing an immense recoil force.
what is black hole??
A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.

what is a galaxy??? A galaxy is, by definition, any large collection of stars that can be recognized as a distinct physical entity

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