Definitions for "Hubble Space Telescope"
A large astromical optical telescope placed into orbit around the earth, from which, in the absence of absorption and distortion by the earth's atmosphere, clear high-resolution images of astronomical objects can be obtained in the visible, infrared, and ultraviolet wavelengths. The telescope was launched into orbit on April 24, 1990. Since then the telescope has taken thousands of images, many of them unique, recording never before seen astronomical phenomena. Service missions were performed in 1993 and 1997, during which astronauts upgraded or replaced equipment on the telescope. Link to Hubble Telescope Information.
NASA's automated reflecting telescope in space, capable of observing with unprecendented accuracy radiation spanning the near-infrared, throughtout the visible, and into the deep ultraviolet parts of the electromagnetic spectrum; flagship of the Great Observatories.
Hubble orbits 600 kilometers (375 miles) above Earth, using excellent pointing precision, powerful optics, and state-of-the-art instruments to provide stunning views of the Universe that cannot be made using ground-based telescopes or other satellites. Hubble was originally designed in the 1970s and launched in 1990.
Keywords:  quasar, five, group
a group of five quasar