Revise GCSE Physics


Question:What is Hubble's Law?

Hubble's law says that the distance to other galaxies is directly proportional to how quickly those galaxies are moving away from the Milky Way.

So a Galaxy that is twice as far away from our Galaxy is moving away twice as quickly; and a Galaxy that is moving away at a third of the speed of another Galaxy will only be a third of the distance away from ours.

Angry face

Graph of Hubble Law data for some real galaxies.

Video exlpaining Stellar red shift and Hubble's Law as proof of Big Bang theory.