Hubble's red shift observation.
A theory because a hypothesis is a plan that you had to think through to answer a question not to predict the big bang.
The Big Bang is a theory that discusses the origin of the universe (from a single point source of incredible density and energy) while the Nebular Hypothesis is a theory that discusses the origins of stars and their planetary systems (through the accretion of interstellar gas).
The Big Crunch hypothesis.
the big bang
The Big Bang hypothesis is one of the theories that try to explain the origin of the creation of the universe. It's the current most accepted theory by scientists and astronomers. It asserts the universe and all the planets and systems it contains were formed after an immense explosion of matter and energy out of an original point.
Our concept of the "big bang" has no explanation about how or why, but our hypothesis is that there was NOTHING before the Big Bang created the universe.
The Big Bang Theory - 2007 The Big Bran Hypothesis 1-2 is rated/received certificates of: Argentina:13
Fred Hoyle was so dismissive of the primordial atom hypothesis of our Universe that he invented a perjorative description of it: he called it the "Big Bang" Hypothesis.
universe
The Big Bang Theory - 2007 The Infestation Hypothesis 5-2 is rated/received certificates of: Netherlands:AL
because it explains about universe
The Big Bang Theory - 2007 The Alien Parasite Hypothesis 4-10 is rated/received certificates of: Netherlands:AL