A Black Hole is a region in the universe which has enormous density. So enormous that nothing can escape its intense gravitational pull. Not even light can escape the immense gravity of a Black Hole. A Comet is a large chunk of ice and rock that can leave a tail of dust debris over 50 million miles long. From ancient times to the present day many comets, such as Haley's Comet, have returned to appear in our night sky.
Meteors are more common than comets.
Meteors are often referred to as falling stars, and appear as a flash of light as they enter Earth's atmosphere. Meteors are particles as small as dust, generally coming from comet debris, and are called meteorites when they strike Earth. This was the first time we have witnessed a collision in our Solar System. This was perhaps the greatest scientific achievement in the history of mankind. Updated Every 15 Minutes.