Name the joint US/Europe orbiting telescope launched in 1990?
Space telescope Hubble Space Telescope, which was launched on April 24, 1990 by the Space Shuttle "Discovery" (STS-31). Performing astronomy from ground-based observatories on Earth is limited by the filtering and distortion of electromagnetic radiation (scintillation or twinkling) due to the atmosphere. Some terrestrial telescopes can reduce atmospheric effects with adaptive optics. A telescope orbiting Earth outside the atmosphere is subject neither to twinkling nor to light pollution from artificial light sources on Earth. As a result, the angular resolution of space telescopes is often much smaller than a ground-based telescope with a similar aperture. Space-based astronomy is even more important for
Orbiting Astronomical Observatory 2 for ultraviolet observations. For example, there was a photoelectric photometer fed by a 16-inch (40.64 cm) telescope with a six-position filter wheel. WEP observed over 1200 targets in ultraviolet light before the mission ended in early 1973. The observatory was overall about 10 ft by 7 in the shape of an octahedron and it weighed 4400 pounds. Orbiting Astronomical Observatory 2 The Orbiting Astronomical Observatory 2 (OAO-2, nicknamed Stargazer) was a space observatory launched on December 7, 1968. An Atlas-Centaur rocket launched it into a nearly circular altitude Earth orbit. Data was collected in ultraviolet on many sources including comets,