NASA's Hubble Telescope marks 33 years in space

This day, 33 years ago, NASA's Hubble Telescope took to space. The observatory has made well over 1.5 million observations, since its launch in 1990. From its vantage point, about 535km above Earth's surface, the telescope can provide views of space with better detail than ground-based observatories. The Hubble Space Telescope helped determine the truth about the expansion of the universe.