Question

What did Edwin Hubble discover? How did his work make a difference to how we understand the universe?

Answer 1

Hubble discovered that the Universe is expanding.

Explanation:

Hubble discovered that the Universe is expanding. Prior to his discovery, it was assumed that the Universe had always been here and never changed. But with the discovery of the expanding of the Universe, questions began to swirl - if the Universe is expanding, from where is it expanding? (And thus came the theory of the Big Bang). And if it's expanding now, will it do so forever? And what mechanism is causing the Universe to expand? (And now they've discovered that the Universe is expanding faster and faster, bringing about the theory of Dark Energy).