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Cosmological horizon

space Maturity 11-13

Space is very, very big.

Spacetime-diagram-flat-universe-comoving-coordinates.png
Spacetime-diagram-flat-universe-comoving-coordinates.png
Light travels from far away. Some light can reach us. Some light is too far. We can only see so much. It is like a big wall. Can you see the stars?

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File:Spacetime-diagram-flat-universe-comoving-coordinates.png
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📚 Content adapted from Wikipedia | Readability: FK 14.1 | Vital Level 5