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 8 of 31 In 2001, Hubble observed an explosion 10 billion light-years from our planet greatly bolsters the case for the existence of a mysterious form of "dark energy" pervading the cosmos.Credit: NASA and A. Reiss 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.