this post was submitted on 16 Jan 2025
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[–] Honse@lemmy.dbzer0.com 8 points 1 year ago (3 children)

Technically any object of sufficient size would colapse under its own immense gravity and form a black hole

[–] smeg@feddit.uk 4 points 1 year ago

And technically once it has collapsed it isn't very big anymore!

[–] CrayonRosary@lemmy.world 3 points 1 year ago (1 children)

Isn't the universe a sufficiently large size? Why is it expanding then? What constitutes an "object"?

[–] PoastRotato@lemmy.world 4 points 1 year ago (1 children)

Most of the universe is empty space, and that's what's expanding. Empty space doesn't have any gravitational pull

[–] CrayonRosary@lemmy.world 0 points 1 year ago (1 children)

Solid objects are 99.999999% empty space, too.

[–] PoastRotato@lemmy.world 1 points 1 year ago

Yes, but nuclear forces are strong enough to keep the space within from expanding and hold the objects together. It's in the vast swathes of emptiness between galaxies that we typically see the exansion of space because gravity is too weak there to keep things together.