What observational evidence is directly associated with the Hubble-Lemaître Law?

Answer

Redshift, showing distant galaxies recede faster than nearby ones.

The Hubble-Lemaître Law describes how galaxies move away from us, and this recession is observed as a redshift, where light waves are stretched by the expanding space between us and the source.

What observational evidence is directly associated with the Hubble-Lemaître Law?
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