I’d like the sky to be darker where I live so I could see more stars 🙂
We have a great deal of ‘light pollution’ from streetlights, cars, and houses, which means we see the sky beneath a fuzzy veil of extra light.
I’d like the atmosphere to be more stable, so star didn’t twinkle and we could then use telescopes much easier to get pictures as good as hubble.
Oh – and I’d like it to be transparent in the infra red and microwave for similar reasons!
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