... pressure to support the star against its own gravity, giving rise to an object with a radius about fives times the radius of the sun. The escape velocity from the surface of such a star would be about a thousand kilometers per second. When a star had exhausted its nuclear fuel, there would be nothing ... black-hole research involve discussions of mirror images of black holes, white holes, in which material erupts. What are white holes? The law of physics are time-symmetric. So if there objects called black holes into which things can fall but not get out, there ought to be other 4 ... ...

• Word Count: 3023
• Approx Pages: 12
• Grade Level: High School