A black hole is a section of space that has a gravitational
force solid enough to prevent anything, as well as light, from escaping. The
escape velocity of a star or planet is defined as, how fast an object must be
moving to escape its gravitational field. Since the singularity of a black hole
has infinite density, the attraction of its gravity is so tough that the escape
velocity is more than even the speed of light. For instance the speed of light
is as well the speed of all of the electromagnetic spectrum, no rays (counting
gamma, X-rays, visible light and radio waves) can outflow. This is the reason
why black holes are invisible to us.
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| Source: Dailygalaxy.com |
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