A Black Hole is a hypothetical celestial body with a gravitational field so strong that not even electromagnetic radiation can escape its proximity. The body is surrounded by a spherical border, called the event horizon, through which light can enter, but cannot exit, so it appears to be completely black.
A field of these characteristics may correspond to a high density body with a relatively small mass, such as that of the Sun or lower, which is condensed in a much smaller volume, or a low density body with a very large mass, such as a collection of millions of stars in the center of a galaxy.
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