What is Hubble’s law?
Quick Answer
Hubble’s law states that galaxies generally move away from us faster the farther away they are. It is expressed by the idea that recession speed is proportional to distance.
The Full Story
Hubble’s law was established in the late 1920s after Edwin Hubble observed that distant galaxies have larger redshifts. This led to the relationship v = H0d, where v is recession speed, d is distance, and H0 is the Hubble constant. The law is a cornerstone of observational cosmology because it shows the universe is expanding. It also allows astronomers to estimate distances across the cosmos. Modern measurements refine the value of the Hubble constant, though different methods still give slightly different results.
Key Facts
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"The deeper you look into space, the faster galaxies seem to flee."
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