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SESK: Stuff Everyone Should Know · sesk.info/astro-hubble-law

What relationship does Hubble's law express?

Recession speed is proportional to distance.

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  1. Mass equals luminosity
  2. Age equals redshift
  3. Velocity equals H0 times distance ✔

Why: For galaxies participating in cosmic expansion, more distant galaxies generally recede faster. The compact relation is v equals H0 times d.

Huh, didn't know that: Local gravitational motions can add scatter around the relation for nearby galaxies.

The dad joke
Hubble's law gives distant galaxies plenty of room to speed away.
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References

Answer: Velocity equals H0 times distance. For galaxies participating in cosmic expansion, more distant galaxies generally recede faster. The compact relation is v equals H0 times d.

  1. Hubble Glossary science.nasa.gov/mission/hubble/multimedia/hubble-glossary
    Hubble's Law describes the relationship of velocity and distance by the equation V=H0 × d
    Checked 2026-10-10.

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