Well I believe in the theory i mentioned before. it contradicts its self so i do believe that there has been multiple big bangs...in millions of years, i believe there shall be another one because all of the mass will come together, then explode.
This is the kind of subject that has an endless chain to it.
Example-What created the universe? big bang. Who created big bang? God. who created him? who created him? who created him.....so on so forth. it is a never ending chain. and if aliens created humans, who created the aliens?
On the subject of aliens..we learned that there is life in space from a meteor that flew down and hit earth that came from Mars. when they were examining the meteorite, they seen fossilized single celled organisms. not intelligent life. but it is still life.