In the verification of the Hubble law for the expansion of the universe and the determination of the constant H₀,the greatest difficulty has been:

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The accurate determination of distances to very distant galaxies has been the greatest difficulty in verifying the Hubble law and determining the constant H₀. This has been a challenging task as the distances to these galaxies are very large, and traditional distance measuring techniques such as parallax and standard candles are not applicable at such distances. Therefore, astronomers have had to develop new methods such as using Type Ia supernovae as standard candles to measure the distances to these galaxies.

In the Verification of the Hubble Law for the Expansion