Action/Reaction

<...for every action there is an equal and opposite reaction...> ("Newton 3") applies to the physics of mechanical motion.

Newton's law about actions and reactions is another way of describing the conservation of momentum. A bomb is sitting at rest before it explodes with fragments flying in all directions. Momentum is conserved, with as much "mass times velocity" flying in one direction as in the opposite direction, equal and opposite action and reaction.

The Big Bang wasn't actually an explosion but an expansion of space itself, whereas an actual explosion would result in matter moving through space. Think of a balloon that is being inflated. If there were ants crawling on the balloon, they would move farther apart in addition to their motion with respect to the balloon.

before and after?

...assume the big bang expansion never happened is one option

Poor cat. Looks like he has a serious breathing problem...

My guess is that Big Bang, sounds impressive. If they called it " The little bang " nobody would pay much attention. The thing is, there was nobody around then, so nobody really knows if it was big or if it was a bang. If space is indeed expanding, then when " it " happened, space must of been really small, so more than likely, it would be little. And since you can't hear sounds in space, there might have been an explosion, but you ( not you ) couldn't of heard a bang. So, for shits and giggles, it's called the big bang. Someday, aliens will land on earth and everything we have always thought that was will be explained and we might find out that everything we thought was is not really how everything really is.

Why would aliens want to land on earth?

Why would we want to land in a fire ant colony?

They may use us as a tourist attraction,and do a few "fly-bys" from time to time,or grab a few samples for research,but there is hardly anything on Earth that would be interesting to such an evolved species.Any minerals and resources available on Earth are more plentiful and concentrated in the asteroid belt.

Alien tourist to his son:

"Down below,you will see the Earthlings,engaged in their eternal conflicts with each other,fighting over opinions,beliefs,and territory,expending their knowledge and resources developing more efficient ways of killing each other.

"And their most brilliant scientists are forever pondering the answer to the universe."

"There are only a few different races of humans with skin colors ranging from white,to bronze to dark brown.And they even fight over their skin color.What do you think would happen to a green or purple or orange species,like us?

"No,son,we cannot land and look around".

"But father,don't they know that the answer is 42?"

Even though the number 42 turns up very frequently in studies of the universe,Hubble's constant,etc,

I personally think the answer is Pi,to the last digit,and the universe is expanding to find the last digit.

http://www.independent.co.uk/news/yes-the-answer-to-the-universe-really-is-42-1351201.htmlhttp://www.independent.co.uk/news/yes-the-answer-to-the-universe-really-is-42-1351201.html

"Big Bang" was a derisive term coined by Fred Hoyle, a proponent of the steady-state theory.

"Sir Fred Hoyle, one of the most creative and provocative astrophysicists of the last half century, who helped explain how the heavier elements were formed and gave the name Big Bang, meant to be derisive, to the theory of cosmic origin he vehemently opposed, died on Monday in Bournemouth, England. He was 86 and lived in Bournemouth."

http://www.nytimes.com/2001/08/22/world/fred-hoyle-dies-at-86-opposed-big-bang-but-named-it.html

We are star stuff. The universe made manifest. Trying to figure itself out.

We are in the remedial galaxy.

The reaction to the big bang was that the devil became very angry.