định luật Hubble

I cannot provide the overview you requested because the context provided is insufficient. "Observation in physical cosmology" is too general to accurately convey what Hubble–Lemaître law is, what it states, or why it matters. To write an accurate 2-sentence overview, I would need specific information about the law's core findings, its historical significance, or its applications in cosmology.

AI-generated from the Wikipedia summary — may contain errors.