If space is infinite, it's hard to grasp. If it ends, what's on the other side? Explore how the geometry of reality shapes our cosmic horizon.

We don't need the universe to be infinite to find infinite wonder within the part we can see. Our observable universe is 46 billion light-years of history, stars, and potential, which is an unimaginable amount of space to explore and understand.
The universe is unsettling no matter which way you imagine it. If it’s infinite, then there is no edge—just endless space with no final point. But if it ends, that may be even more disturbing. What does it mean for reality to simply stop? A wall, a boundary, an edge of existence—both possibilities feel impossible. Either the universe goes on forever, or it ends in a way our minds can barely process.


샌프란시스코에서 컬럼비아 대학교 동문들이 만들었습니다
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샌프란시스코에서 컬럼비아 대학교 동문들이 만들었습니다

Nia: You know, Jackson, I was looking up at the stars last night, and I had this sudden, overwhelming realization. We’re essentially standing on a tiny island in a dark ocean, and we have no idea if that ocean ever actually ends. It’s unsettling to think that either the universe goes on forever—which is impossible to wrap your head around—or it just... stops. Like a wall at the edge of existence.
Jackson: It really is the ultimate "no-win" for our intuition, isn't it? If it’s infinite, every possible version of us might exist out there in the dark. But if it’s finite, we have to face the idea of a hard boundary. What’s wild is that we can actually see a limit—the observable universe—which stretches about 46 billion light-years in every direction. It’s a horizon of light, but it’s not necessarily the end of space itself.
Nia: Right, it’s like being on a ship and seeing the horizon, but knowing there's more water beyond it.
Jackson: Exactly. And whether that "water" wraps around like a loop or stretches into infinity depends on the very shape of reality. Let’s explore how the geometry of space might hold the secret to whether we're living in an endless expanse or a giant cosmic mirror.