Very cool stuff. It is always wild to me that the universe is/approximates infinite yet galaxies aren't densely packed enough that the occlude each other at the furthest distances we can detect. Much like Protons in atoms, though there are quadrillions of them in every planet and star, a neutreno can travel a straight path for eons through multiple galaxies and never touch one. What a crowded yet vastly empty universe we have.
The crazy thing to me is that as you look at galaxies further away, they become bigger in the sky. Obligatory xkcd: explainxkcd.com/…/2622:_Angular_Diameter_Turnarou… There could be huge dragons out there occluding half the sky, but they’d be beyond the last scattering surface of the cosmic microwave background.
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Very cool stuff. It is always wild to me that the universe is/approximates infinite yet galaxies aren't densely packed enough that the occlude each other at the furthest distances we can detect. Much like Protons in atoms, though there are quadrillions of them in every planet and star, a neutreno can travel a straight path for eons through multiple galaxies and never touch one. What a crowded yet vastly empty universe we have.
The crazy thing to me is that as you look at galaxies further away, they become bigger in the sky. Obligatory xkcd: explainxkcd.com/…/2622:_Angular_Diameter_Turnarou… There could be huge dragons out there occluding half the sky, but they’d be beyond the last scattering surface of the cosmic microwave background.