How NASA Saved Hubble
It’s so easy to forget that when Hubble first launched in 1990 that it was a total disaster because the lens on the main mirror couldn’t focus — yet 19 years later it’s one of the best NASA success stories in recent history. This video tells he story of the team that replaced the mirror back in 1993. Here’s a before and after photo to show how much of an improvement the mirror fix made: