The Big Bang Theory explains
The theory of relativity happened in what century?
Approximately how old is the universe?
The Steady State theory also involves an expanding universe, except that it does not call for a universe with a beginning.
The Steady State theory also involves a beginning of the universe, except that it assumes that the universe is collapsing.
A shield volcano consists of
The largest volcano on Mars has the name
Stellar evolution is the process by which the ratio of Type-1 and Type-2 stars has changed since the big bang.
Stellar evolution is the process by which a star changes during its lifetime.
Most stars more massive than the Sun end their lives as Supernovae. copied verbatum
A black hole is defined as any object that absorbs all the light that strikes it