Black hole.
What is a black hole? The term "black hole,, was first used by "John Wheeler,, in 1967 ,the word itself is very suggestive and interesting. it was unthinkable and unbelievable in the 20th century but just a few years ago, it officially came to pass. his discovery and research have been greatly influenced by " Stephen Hawking, , who was even called a black hole hunter. A black hole is a place in the cosmos where gravity is so strong that nothing can escape from it also light. strong gravitation arose because the material is placed in small space, such compression occurs at the end of the star. some came just after the death of the stars, black holes are invisible because they absorb light. however they can be viewed through special tools. the black holes are in different size. the mass and size of the black hole determine what it looks like.NASA studies black holes with spaceships as the Chandra X-ray observatory, the satellite "swif