Scientists investigate to find out how everything works.
At first there are theories which fit in with what appears to be happening.
Then there are hypotheses about how it got to where it is.
No.
Science starts with a hypothesis. Then they find evidence for the hypothesis. This then becomes a theory, as it has evidence.
A theory can be tested, and if it stands up to scrutiny, it is up held. If it doesn't it is considered wrong.
To quote Feynman:
"In general we look for a new law by the following process. First we guess it. Then we compute the consequences of the guess to see what would be implied if this law that we guessed is right. Then we compare the result of the computation to nature, with experiment or experience, compare it directly with observation, to see if it works. If it disagrees with experiment it is wrong. In that simple statement is the key to science. It does not make any difference how beautiful your guess is. It does not make any difference how smart you are, who made the guess, or what his name is – if it disagrees with experiment it is wrong. That is all there is to it. "Ch. 7, “Seeking New Laws”
Re-testing or refining a theory may bring the theory to be accepted, but not until it stands up to scrutiny.
As for the beginning and life of the universe there are several theories which have been changed or updated to explain, after later discoveries, how it got to be as it is now. Inflation, however implausible, being the most convenient to explain the temperature and how the farthest observable objects have had time to get to where they are.
Still, though, no one knows.
Much of the changes in cosmology, and how the universe began has changed, but since the development of the scientific method, it has simply refined. The media may trumpet a revolution of a new idea turning science on its head, but the truth is that most science in this area gets new ideas that refine the existing ideas. While radical ideas may still come out, they have thus far failed to stand up to scrutiny in most cases.
So, until it is definitively explained with absolute certainty then scientists are not much different than creationists except for the fact that scientists will keep looking until the truth is found instead of blindly believing that 'someone' made it one week about six thousand years ago - only thirteen and a half billion out.
This shows your ignorance.
Scientists test and re-test, and varifiy a theory.
Creationists read the bible and find things to back up their beliefs, and often lie.
I hope you see the diference.
I believe the the new Pope has just arranged forgiveness for Galileo after his 'heresy' in discovering, though being afraid to say for fear of 'the Church', that the Earth revolves around the Sun.
I presume everyone now believes Galileo.
Ah, a nod towards the Galileo Fallacy. I see you're not afraid of cliches.
http://rationalwiki.org/wiki/Galileo_gambit