Question

What is Hubble's Law and why is it important?

Answer 1

Hubble's law is a direct consequence of the ongoing expansion of the universe and that the evidence suggests that the universe began in an explosion, which we call the Big Bang. There are a couple of important caveats that apply to Hubble's Law.

Answer 2

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✔✔ Hubble's law says that galaxies move away from each other at a speed proportional to their distance.

✔✔ It is the basis for confirming that the universe is expanding.

✔✔ The exact value of the Hubble constant, H, is so important in extragalactic astronomy and cosmology – it leads to an estimate of the age of the universe, helps test theories of Dark Matter and Dark Energy, and much more – a great deal of effort has gone into working it out.

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