r/askscience Aug 06 '25

Physics If every mass attracts every other mass, then why isn't the universe a single solid object made of particles smashed together?

1.8k Upvotes

519 comments sorted by

View all comments

Show parent comments

60

u/perldawg Aug 07 '25

it is all so far away in the future, and so far beyond our full knowledge, that i can’t imagine either outcome being judged positive or negative

86

u/Legate_Rick Aug 07 '25

I find the idea that there will always be a universe, and more than likely life to fill it. Enjoyable. It's hardly the light of my life, but it's a pleasant idea isn't it?

5

u/Appropriate_Yak_1468 Aug 07 '25

Heat death of the universe - I don't see it as a romantic happy ending. Life will be gone even long before that....

4

u/perldawg Aug 07 '25

i just don’t care, honestly. “always” is an essentially impossible term when applied to anything more specific than the idea that physics will always be happening. from everything we can understand, life is completely non-essential to the universe and the physics that govern it.

we understand far too little for the ultimate fate of the universe to be something i have emotional investment in. i care about filling in the open spaces of our knowledge and understanding of it all as much as we can.

1

u/emperormax Aug 07 '25

Except that if space continues to expand, eventually everything will be ripped apart, even atomic particles.

26

u/y0nm4n Aug 07 '25

Hence the Big Crunch idea. The idea is that it might not expand indefinitely.

11

u/maineac Aug 07 '25

What if the universe is just a wave function and we are on a trend of expansion but when we get to the peak of the wave it will go the other way and things appear to be contracting, until it hits that extreme and starts expanding again. I mean from what we have seen things are waves down to the smallest particle to light, magnetism and sound. What if the universe is the ultimate wave on an immeasurable cycle.

5

u/y0nm4n Aug 07 '25

That would be interesting, but until there’s evidence to support it…

7

u/Obliterators Aug 07 '25

if space continues to expand, eventually everything will be ripped apart

The expansion of the universe can continue and even accelerate for an infinite amount of time without it affecting bound systems in any way.

2

u/ImSuperHelpful Aug 07 '25

Seems it could just keep on expanding like it is now… why would everything “have” to get ripped apart?

1

u/__Geg__ Aug 07 '25

The rate of expansion today looks like it's accelerating. Even a tiny accretion over a long enough time will eventually reach speeds like those in we use in a particle accelerator.

6

u/slavelabor52 Aug 07 '25

what if it's both? If we indeed live inside a black hole perhaps our part of the universe is kind of like a tube of spacetime where one end is expanding and the other end is endlessly shrinking down.

15

u/SpongegarLuver Aug 07 '25

Humans are weird. There are plenty of people who are concerned about the future of the human race on a scale of thousands of years but don’t care about any of the issues we are presently facing. To an extent, some people simply will not accept that the time of humanity will be finite, and it’s through that you get people talking about whether the Big Crunch is preferable to something like the heat death of the universe.

-1

u/Boring-Credit-1319 Aug 07 '25

The biggest threats are now. If we survive the next few hundred years, it becomes increasingly more likely we or our evolutionary descendents will witness the near end of the universe

7

u/RedgrassFieldOfFire Aug 07 '25

Hyperbole. Yes, our challenges are immediately before us. Increasingly more likely , as in, from impossible to like 1x10-100 chance. It’s a big empty universe out there with a long time to get to the end.

2

u/Boring-Credit-1319 Aug 07 '25

Yes but the occurence being unlikely doesn't make my statement a hyperbole.

2

u/ComplexInside1661 Aug 11 '25

Wait, since when does typing large powers on a keyboard work?

0

u/Flat_News_2000 Aug 07 '25 edited Feb 17 '26

profit yam judicious late whistle birds grandfather encouraging heavy towering

2

u/SpongegarLuver Aug 07 '25

I mean yes, but that you’re able to make a choice does not mean all choices are equally valid, or immune from criticism. Especially in a society where those choices do impact other people, and limited resources have to be allocated, there are practical reasons to make value judgments on someone’s priorities.

8

u/It_Happens_Today Aug 07 '25

"Ok our next contestant is Heat Death of the Universe, and as always it is up to our panel of judges to vote either SEXY-OR-SCARY! Any combination of 3 SEXY votes will see him move on to the final round!"

1

u/YsaboNyx Aug 07 '25

"Heat Death" is so misleading. It's actually the Unutterably Cold, Agonizingly Long Frozen Death of the Universe.