Скачать или смотреть The Observable Universe Is Just a Tiny Fraction of What’s Out There—Find Out Why!

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We often imagine the Universe as something endless and open — a place where, at least in theory, we could one day see everything.
But the truth is far stranger.

There is a real limit to how much of the cosmos will ever be visible to us. Not because our telescopes aren’t powerful enough, and not because we’re too far away — but because space itself is expanding. Some galaxies are already receding so quickly that their light will never reach us, no matter how long we wait.

This invisible boundary is called the cosmic horizon. Beyond it, the Universe continues — forming stars, galaxies and entire structures — yet their light will never cross into our corner of spacetime.

We happen to live in a rare moment when the night sky is still full of distant galaxies. Far in the future, most of them will fade beyond reach, leaving only a small island of matter behind. Astronomers who live then may never even suspect how vast the cosmos once appeared.

This episode is about that horizon — what it is, why it exists, and what it means to live inside a Universe that we can only ever glimpse through a shrinking window of light.
#space #astronomy #cosmicweb #science #cosmos #nasa #galaxies #astrophysics