Let me drop some more perspective on you. Here's our old friend, the Oort Cloud. Picture billions upon billions of icy little comets tumbling around in a vast sphere, such that our entire solar system is enshrouded in a cloud of ice. A shell, like the electron shell.
It's big - extending almost a light year in all directions from the Sun. And then as you see, far closer in, is another sphere, or shell, of icy bodies, but also rocky bodies too - like Pluto. The Kuiper Belt, another shell - also like the electron shell.

So again picture this from far away in space, looking towards the Sun. First a giant cloud of white ice, floating lazily in a vast sphere. And another sphere of ice and rock far within that, and then tucked inside that shell are planets, and a star.

Every star with planets probably has something similar. And so now look up into the dark sky and picture every star you see as a white egg of ice shells, within beats the bright nucleus of a galactic atom. Together these atoms join with vast clouds of gas to create galaxies, and galaxies join other galaxies strung along in necklaces of dark matter, grouping in vast clouds of millions of galaxies, stretching.... forever?
Is a shell forever?

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