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In what direction is the universe expanding?

Parra

Referee
Messages
24,547
But, if everything is expanding outwards from each each other, if you hit rewind then all mass would be getting closer to each other, and given enough time, end up all together in one location.

That's the big chill vs big crush. As far as we know it will keep expanding forever. Local gravity still has an effect, I suppose locally things get together while universally they get further apart.
 

Knight76

Juniors
Messages
2,004
That's the big chill vs big crush. As far as we know it will keep expanding forever. Local gravity still has an effect, I suppose locally things get together while universally they get further apart.

Yes but the big bang being something that happened everywhere all at once isn't the accepted theory is it?

The rewind point is that if we rewound time, given all galaxies, and clusters of galaxies are heading away from each other at the same time, therefore away from a central starting point, then how could the big bang have happened everywhere all at one.

If all everything is moving outward and away from each other, the reverse must be true if time is rewound, everything must be moving inward and getting closer to each other, to the point where it all comes back together at a spot.

At some point, there was nothing anywhere else but one place! and then the big bang happens and shit is flung every which way.
 

Parra

Referee
Messages
24,547
Yes but the big bang being something that happened everywhere all at once isn't the accepted theory is it?

The rewind point is that if we rewound time, given all galaxies, and clusters of galaxies are heading away from each other at the same time, therefore away from a central starting point, then how could the big bang have happened everywhere all at one.

If all everything is moving outward and away from each other, the reverse must be true if time is rewound, everything must be moving inward and getting closer to each other, to the point where it all comes back together at a spot.

At some point, there was nothing anywhere else but one place! and then the big bang happens and shit is flung every which way.


I think it is covered earlier in this thread - matter is not being flung anywhere, it is spacetime that is expanding. So things (galaxies for example) need not be moving at all - yet the distance between them increases. The big crunch is a theory https://en.wikipedia.org/wiki/Big_C...runch is a,universe starting with another Big . From the little bits I've read it seems that the evidence is that this is slightly inlikely, with infinite expansion more likely,
 

mongoose

First Grade
Messages
9,191
Yes but the big bang being something that happened everywhere all at once isn't the accepted theory is it?

The rewind point is that if we rewound time, given all galaxies, and clusters of galaxies are heading away from each other at the same time, therefore away from a central starting point, then how could the big bang have happened everywhere all at one.

If all everything is moving outward and away from each other, the reverse must be true if time is rewound, everything must be moving inward and getting closer to each other, to the point where it all comes back together at a spot.

At some point, there was nothing anywhere else but one place! and then the big bang happens and shit is flung every which way.

I think humans naturally visualize the big bang as a starting point or singularity which expands outwards forever like a giant balloon but it can't have happened like that because space didn't exist before the big bang. How can a space (universe) expand out into other space that isn't there? Humans can't conceptualise there being no space and no time, therefor its virtually impossible to conceptualise the big bang happening.
 

Knight76

Juniors
Messages
2,004
I think humans naturally visualize the big bang as a starting point or singularity which expands outwards forever like a giant balloon but it can't have happened like that because space didn't exist before the big bang. How can a space (universe) expand out into other space that isn't there? Humans can't conceptualise there being no space and no time, therefor its virtually impossible to conceptualise the big bang happening.

But they know with fairly high confidence that at some point in the past, there was either a singularity or there was a very small spot of well, stuff. Which for whatever reason rapidly expanded. Before that rapid expansion, beyond the borders of this stuff was nothing. A void.

Then the big bang occurred and space time was sent outwards rapidly, expanding the universe.
 
Messages
10,218
I think humans naturally visualize the big bang as a starting point or singularity which expands outwards forever like a giant balloon but it can't have happened like that because space didn't exist before the big bang. How can a space (universe) expand out into other space that isn't there? Humans can't conceptualise there being no space and no time, therefor its virtually impossible to conceptualise the big bang happening.
Therefore, the Big Bang never happened

There can’t be nothing.

Everything is something, even vacuum.
 
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Messages
10,218
i'm not saying it didn't happen, i'm saying that whatever exists outside of space and time is not something the human brain can grasp.
I respectfully disagree because you may be assigning a quality or attribute to something we don’t know enough about.

We could well understand it if we knew what it was.
 
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Messages
10,218
What about space? You can't separate the two.
Yes, your point is well made.

Im not sure what to do with time.

Just off topic a bit…

0AABE732-2A0A-40D9-94F9-7469D46C9228.jpeg
Here’s my ufo snap from last year although I still don’t believe in them.

As best guess, it was off the coast of Sydney travelling in a southerly direction late one night.

And it wasn’t going too fast for a little while, but then it disappeared.

It could be a satellite or something, but strange colour, teal orby glob.

Just out of shot, upper left is the moon.

@Timmah and the other professional visual artists on the forum can do their thing and conclude the photo hasn’t been doctored. I’m not that proficient. Can barely use a crayon!
 
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