Jump to content

Scale of the universe


Allen
 Share

Recommended Posts

What's interesting is that if you try to go beyond the bubble that is the universe, there is no "beyond:" no empty space, nothing.

Yet the universe is currently expanding, creating new space.

So the big question is: Is there enough matter in the universe to slow down the expansion, which began around 16 billion years ago with the Big Bang, bring it to a stop and begin contracting?  If so, does that mean similar expansions and contractions have been going on forever?  Where did it all come from - was there or is there a deity aspect to all this?

But even more interesting, is that we may be able to live a second life backwards (we may not realize it's backwards) if the universe contracts.

Time is a strange property.  To almost everything in nature there is symmetry: left-right, up-down, backward-forward, positive and negative electricity, north and south magnetic pole, etc.

If we meant to pick up a pencil but forgot and moved to the right, we can move to the left and get it.

But, if we burn dinner because we cooked it too long, we can NOT go back in time and un-burn it.  That does NOT fit in with the properties of the universe.

The late, great Stephen Hawking said that Entropy is "the arrow of time."  Entropy is a measure of disorder and, as the universe expands and gets less ordered, the Entropy of the universe is always increasing.  In fact, that's the 3rd Law of Thermodynamics.  So we always see time moving forward.

But, if the universe begins to contract, Entropy will begin to decrease.  So does that mean time will run backwards.  If so, in another 50 billion years, we may all be doing this forum backward - though we may not realize it.  Of course, it may reverse and not do the exact same things in reverse. But it's fun to think about!

Link to comment
Share on other sites

2 hours ago, MickinMD said:

Entropy is a measure of disorder and, as the universe expands and gets less ordered, the Entropy of the universe is always increasing.  In fact, that's the 3rd Law of Thermodynamics

Then there is the question about the contradiction between entropy and life.  Life is incredibly ordered and structured.  Increasing entropy not so much.  

2 hours ago, MickinMD said:

Time is a strange property.  To almost everything in nature there is symmetry: left-right, up-down, backward-forward, positive and negative electricity, north and south magnetic pole, etc.

Maybe we just don't know how negative time can exist in our reality of the universe.  

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...