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  • Hubble Space Telescope Probes a Galaxy with an Active Nucleus
    NASA's Hubble Space Telescope (HST) has provided an unprecedented, detailed view of highly energetic events in the core of a galaxy 30 million light-years away. The observations are a first step in HST's search for super-massive black holes at the nuclei of active galaxies. Holland Ford (Johns
  • Hubble Space Telescope Searches for a Historic Nova in Globular Cluster M14
    NASA's Hubble Space Telescope (HST) has successfully completed the first stage of a cosmic detective hunt for a rare star, called a nova, which erupted half a century ago. HST's needle-in-the-haystack search has provided astronomers with an unprecedented view of the crowded inner region
  • Optical Metrology for Large Telescope Optics
    design specifications. More recently, "dynamic interferometry" has been implemented for vibration-insensitive measurement of large optics. The data is used to control polishing operations, verify dimensional stability of support structures, align mirror segments and complete other critical
  • Ancient Black Hole Speeds Through Sun's Galactic Neighborhood, Devouring Companion Star
    Data from the Space Telescope Science Institute's Digitized Sky Survey has played an important supporting role in helping radio and X-ray astronomers discover an ancient black hole speeding through the Sun's galactic neighborhood. The rogue black hole is devouring a small companion star as the pair
  • Heavy-Duty Lift Reaches for the Stars
    Facility provides office space for 40 astronomers, engineers and support staff, laboratories and a center for remote operation of the telescope using a fiber-optic communication link. The crew requires a lift to move heavy equipment up to the top of the telescope for maintenance and repairs
  • Hubble Confirms Existence of Massive Black Hole at Heart of Active Galaxy
    Astronomers using NASA's Hubble Space Telescope have found seemingly conclusive evidence for a massive black hole in the center of the giant elliptical galaxy M87, located 50 million light years away in the constellation Virgo. Earlier observations suggested the black hole was present, but were
  • Dynamic Interferometry: Getting Rid of the Jitters
    Conditions on the factory floor and in industrial cleanrooms with high-capacity air filtration systems can hamper the use of interferometry. Another problem is the testing of large-aperture mirrors where it is difficult to mechanically isolate them and the structures needed to support the optical
  • Dynamic Interferometry Handles Vibration
    is the testing of large-aperture mirrors (1-10 m) when it is difficult to mechanically isolate such mirrors and the structures needed to support the optical test; in addition, long optical paths produce air-turbulence problems. To make things worse, the next generation of large-aperture lightweight mirrors

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