The people of the world has always research about the birth of the universe.The big bang theory has been argued that the universe is always expanding outward from a central point.Extremely large mass and energy were promoted outward. Then,the density gradually became cooling and smaller.The astronomers and cosmologists has been able to confirm the big bang theory using the new technology at the beginning of the 20th century.
In 1924, astronomer Edwin Hubble has devised the cosmic distance ladder.He was able to measure the background and we had known how the universe was born.Scientists have learned more about the origins of the Big Bang by calculating how fast stars and galaxies are expanding away from earth.In 1990, space shuttle was launched. At that time hubble telescope was able to pinpoint the age of the Earth.Cosmologists have the more detailed measurements of various stages of the Big Bang theory now.
However,recently,scientists don't claim to demonstrate how the universe was born or the development.