The Hubble Space Telescope was launched in 1990 and still remains in operation. It was named after the astronomer Edwin Hubble. It is one of NASA’s Great Observatories, along with some others including the Compton Gamma Ray Observatory, the Chandra X-Ray Observatory, and the Spitzer Space Telescope. Hubble’s four main instruments observe in the near ultraviolet, visible, and near infrared spectra. It isn’t the first space telescope, but it is one of the largest and most versatile. Space telescopes were proposed as early as the 1923s. Hubble was funded in 1970s, with a proposed launch in the 1980s, but with problems like the Challenger Disaster, technical delays, and budget problems, the project had to be postponed. When it finally launched in 1990, the main mirror was found to have been ground incorrectly, putting the telescope’s capabilities at risk. The optics were corrected by a servicing mission in 1993. The Hubble Space Telescope is the only telescope in space that was designed to be service by astronauts. Some could say it is one of Space Travels greatest achievements.