Laskeskelin että yötaivaalla voi nähdä 1/200 000 000:s osan linnunradan tähdistä, jos linnunradalla on 500 miljardia tähteä ja yötaivaalla näkee niistä lähimmät 2 500

Joillakin yön tähtitaivas luo kuvan valtavasta, käsittämättömästä maailmankaikkeudesta, jossa on jopa tuhansia tähtiä. Oikeastihan ne yötaivaalla näkyvät tähdet ovat vain 0,00000005% meidän galaksin tähdistä ja galakseitakin on pelkästään havainnoitavassa maailmankaikkeudessa yli 2 000 000 000 000 000.

Havainnottava maailmankaikkeus ei ole koko kaikkeus. Astronomien mukaan maailmankaikkeudessa on loputtomasti galakseja:

"If you’re afraid of infinity, you might say something like this: "So, okay, maybe we’re in a vast infinite space, but it’s mostly empty. Our universe is just a finite number of galaxies rushing away from each other inside this empty infinite space—like a solitary skyrocket exploding and sending out a doomed shower of sparks." But many cosmologists say, no, there are an infinite number of galaxies in our infinite space.

Where did all those galaxies come from? The merry cosmologists deploy a slick argument involving the relativity of simultaneity and the inflationary theory of cosmic inflation—and they conclude that, in the past, there was a Big Bang explosion at every single point of our infinite space. Flaaash! An infinite space with infinitely many galaxies!"

Tämän implikaatiot ovat jännät:

"There are only 1080 particles in the observable Universe, so that's much less than the possible configurations of matter in a cubic meter. If the Universe is truly infinite, if you travel outwards from Earth, eventually you will reach a place where there's a duplicate cubic meter of space. The further you go, the more duplicates you'll find.

Ooh, big deal, you think. One hydrogen pile looks the same as the next to me. Except, you hydromattecist, you'll pass through places where the configuration of particles will begin to appear familiar, and if you proceed long enough you'll find larger and larger identical regions of space, and eventually you'll find an identical you. "