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Comoving and proper distances

space Maturity 7-9

Space is getting bigger.

Spacetime-diagram-flat-universe-proper-coordinates.png
Spacetime-diagram-flat-universe-proper-coordinates.png
It grows all the time. Some ways to measure space stay the same. Other ways show space getting larger. This helps us see the stars. Do you like looking at the stars?

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File:Kugelkoord-lokb-e.svg
Kugelkoord-lokb-e.svg
File:Spacetime-diagram-flat-universe-proper-coordinates.png
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📚 Content adapted from Wikipedia | Readability: FK 14.0 | Vital Level 5