Gallery: Hubble's greatest hits - 20th anniversary Summary: The Hubble space telescope was a total bust after it was dropped from space shuttle Discovery 20 years ago. But some fine tuning turned it into a grand scientific achievement. By Andy Smith | April 28, 2010 -- 10:43 GMT (03:43 PDT) Previous | Next Image 26 of 31 Neptune - the last planet in the solar system.Credit: NASA Topic: Nasa / Space Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.