Hubble space telescope is the largest and the first space telescope, launched in 1990. It is an astronomical observatory. Hubble Space telescope (HST) telescope is named after Edwin Hubble, who was a great astronomer. It has 2.4 meter (7.9ft)mirror. The Hubble Space Telescope (HST) was built by United State’s space agency NASA. Hubble is the only telescope designed to be operated by astronauts in space. How far it can see: 10-15 billion light years. It is NASA’s one of most successful project.