As it stands, NASA, the ESO and the ESA have cataloged a vast collection of stars, nebulae, galaxies, galaxy groups and other large-scale structures, but even they haven't scratched the surface of everything the universe has to offer. For that matter, what we can see is nothing compared to what we will never see — things that lie on the very edge of the observable universe. And the net grows smaller with every passing day.

Indeed, because of the finite speed at which light travels, we see things as they once were — the moon as it was 2 seconds ago, the sun as it was 8 minutes ago, Andromeda as it was 1.5 million years ago, and so on and so forth — not as they are at that very moment in time. If the universe was static, the light would eventually reach us, but because it's not, there are some things we will simply never be able to see in the future, regardless of time.

In this video, Fraser Cain talks about what some of those things might include.

WATCH: "What Will We Never See?"

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