Скачать или смотреть Light-Years: The Closest Thing to Time Travel

When astronomers say something is “5 light-years away,” they’re not just talking about distance—they’re talking about time.

A light-year is how far light travels in one year: 9.46 trillion kilometers!
Here’s the wild part: if you look at a star 5 light-years away, you’re seeing it as it was 5 years ago. The farther we look into space, the further back in time we see—like using a cosmic time machine.

From nearby stars to distant galaxies, every light-year takes us deeper into the universe’s past.

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