Big bang

  • Thread starter Jonnyb42
  • Start date
186
0
How in the heck do physicists know that spacetime was created at the big bang just by observing galaxies moving away from eachother? Couldn't that mean that that's when the MASS was created?
 
2,014
85
You made the classic mistake of thinking that it's motion of galaxies moving away from each other into existing space. It's not. It's not space was there, and boom stuff was created and now it's flying away from each other like an explosion. It's spacetime itsself that is expanding.

You idea that it could just be the mass that was created violates the 1st law of thermodynamics, which if the Universe was existing before hand follows the same phyical laws that govern us. Not only that, but if just the mass was created in the existing universe then there would be a definitive centre that could be found. Also if all the matter were created in 1 single spot, gravity would dominate and it would collapse back in on itsself.

Those are three of the big problem with the idea that it was just the 'stuff' that was created within the universe, not the universe itsself.

There are also many other peices of evidence that point to a small dense hot beginning to the universe.
 

Related Threads for: Big bang

  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
15
Views
3K
  • Last Post
2
Replies
38
Views
9K
  • Last Post
2
Replies
27
Views
5K
  • Last Post
Replies
4
Views
3K
  • Last Post
Replies
3
Views
3K
Top