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What do you think about the idea that supermassive black holes at the center of galaxies were one the first generation of stars? Additionally, what do you think about black hole stars?

Depending on the relative altitudes you could observe something through more atmosphere on earth than looking up at stars.

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It's not that gravity causes the expansion of space to stop, it's just that on relatively "small" scales we can safely ignore the expansion of space. Gravity still dominates even at the scale of galactic superclusters (for now). But increase the scale by comparing entities billions of light years away, and it's the expansion of space that dominates over gravity.

It's not that gravity causes the expansion of space to stop, it's just that on relatively "small" scales we can safely ignore the expansion of space. Gravity still dominates even at the scale of galactic superclusters (for now). But increase the scale by comparing entities billions of light years away, and it's the expansion of space that dominates over gravity.

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Furthermore, from the perspective of somebody 93 billion light years away the universe extends equally in all directions, including the direction opposite to that pointing at us. Therefore it must be infinite.

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Awesome thanks! What do the spheres represent at the full scale volume?

The weirdos, but what can you expect when they walk around in a place where you are clearly at risk of falling off the Earth.

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Yes, but in the case that the universe is just the 3D surface of a hypersphere, it would also be expanding, expanding faster than you could move to come back all the way around again.

This is what Carl Sagan meant by “finite but unbounded”

The 3D universe can be thought of as the surface of an expanding hypersphere. If the universe weren’t expanding, you could go all the way around and come back to where you started.

But since it’s expanding, you’ll never be able to move fast enough to come all the way back around again.

A “finite but unbounded universe”

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Lol, I live in the Seattle Area, you don’t have to glance in order to see mountains. You have the Cascades to the East and The Olympics to the West and they’re both more than an hour away.

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I just watched a video about the concept of black hole stars and the theory is honestly fascinating.

So, are you saying that past a certain magnitude threshold, the force of gravity effectively causes the expansion of space in that region to stop?

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Expansion-wise, sure. But we haven't concretely proven the 'shape' of the universe. Would we end up at the other side? Or would we keep going infinitely far?