Tough, there are so many completely different things that have helped us humans. For quality of life it would have to be something like realising that we can get sick from bacteria and viruses. When we stopped thinking that God was punishing us for something and realised we could do something about being healthy it ourselves our lives got a lot better and we now live longer!
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That’s a hard question! For astronomy, I’d say the Hubble Space Telescope has been pretty important – the first telescope put into space. Without Earth’s atmosphere to get in the way, it suddenly opened up the Universe and allowed us to see things in spectacular detail for the first time.
My most favourite picture ever was taken by Hubble:
Every bright blob in this picture is not a star, but an entire galaxy! Thousands of them, in a tiny region of space. Blows my mind every time!
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