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Tendrils between galaxies is mind-blowing. Aren't galaxies very very far apart? And there is basically nothing in between? How are subatomic particles - baryons - able to survive the constant expansion? Do the tendrils keep getting thinner? Can they be a medium to transmit intergalactic information someday?

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Also, to expand on that (I have no knowledge, just making assumptions), the space between galaxies would need to either create new matter, or the matter would get infinitely spread out over time?

So, if the stretching thing is true, would there be areas with absolutely no matter or anything at all?

In fact, our closest neighbour galaxy is just 25,000 light years away, while the milky way is 100,000 light years across.

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