The black hole's surface is known as the event horizon. ... A rotating black hole has an interesting feature, called a Cauchy horizon, contained in its interior. ... It was shown in the spherical model that the Cauchy horizon does develop a scalar curvature singularity. It was also found that the mass of the black hole measured near the Cauchy horizon diverges exponentially as the Cauchy horizon is approached. ... A black hole is one of the last options that a star may take. ...

• Word Count: 3068
• Approx Pages: 12
• Grade Level: High School

A black hole is baisicly thought to be the last evolutionary stage of massive stars-at least fifteen times as massive as the Sun. ... He found that the uncertainty principle, which says that particles cannot have both a well-defined position of a particle and a well-defined velocity, allows particles to travel faster that light for a short distance, enabling particles and radiation to get out through the event horizon and escape out of a black hole. ...

• Word Count: 905
• Approx Pages: 4
• Grade Level: High School