Issues in Cosmology
The Big Bang is the most widely accepted theory among scientists for the origin of the universe. It specifies that the universe began as a very small speck of space filled with incredibly dense matter. Then the universe began expanding at an astounding rate; in a billionth of a trillionth of a second, the newborn universe doubled and redoubled 100 times over, stretching each atom-sized volume to the size of a galaxy. 1