Write about the most important current theory
for the origin of universe. Describe any two
evidences that support this theory.
Answers
The Big Bang is the most important theory for the origin of universe. It is a way to describe everything that happened during the beginning of the universe. Physics and astronomy discoveries have shown that the universe did have its beginning. Before that moment, there was virtually nothing.
After that moment, there was the universe. The Big Bang Theory is a way of explaining the events at the time of and after the moment. As per the theory, the universe came into being as "singularity" about 13.7 billion years back.
Now, one may ask, what is a "singularity"? Singularities are areas that defy our known concepts of physics. They can be areas that are there in the "black holes" core. A black hole is a place of tremendous gravitational pressure. The pressure in a black hole is so massive that a finite matter can be squished into an infinite density.
Two evidences that support the theory are as follows.
(1) Firstly, now we are sure that the universe had a starting point or a beginning.
(2) Secondly, galaxies seem to be moving away from us. This is happening at speeds that are proportional to their distance. It is also known as the "Hubble's Law,". It is named after Edwin Hubble, the scientist who discovered the occurrence. This "Hubble's Law" is responsible for the universe expansion and also suggests that the whole universe was once quite compact.