X ray surveys

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• cosmic ray — Physics. a radiation of high penetrating power that originates in outer space and consists partly of high energy atomic nuclei. [1920 25, Amer.] * * * High speed particle (atomic nucleus or electron) that travels through the Milky Way Galaxy.… …   Universalium

• Nova Ray — The Nova Ray is a new type of remotely operated vehicle introduced to the public in 2003.[1] It differs from other ROVs, due to its arcuate (bow shaped) wing design. The hydrodynamic design effectively uses water flow rather than resistance to… …   Wikipedia

• Cosmic ray — For the film, see Cosmic Ray (film). Cosmic radiation redirects here. For some background types of cosmic radiation, see cosmic background radiation and cosmic background. The energy spectrum for cosmic rays Cosmic rays are energetic charged… …   Wikipedia

• Marbled electric ray — Not to be confused with Torpedo sinuspersici, also known as the marbled electric ray. Marbled electric ray …   Wikipedia

• Compton Gamma Ray Observatory — General information NSSDC ID 1991 027B Organization NASA …   Wikipedia

• gamma ray — Physics. 1. a photon of penetrating electromagnetic radiation (gamma radiation) emitted from an atomic nucleus. 2. a photon emitted by an electron as a result of internal conversion. 3. electromagnetic radiation with wavelengths shorter than… …   Universalium

• X-ray computed tomography — For non medical computed tomography, see Industrial CT Scanning. catSCAN redirects here. For the Transformers character, see Transformers: Universe. X ray computed tomography Intervention A patient is receiving a CT scan for cancer. Outsid …   Wikipedia

• X-ray background — The observed X ray background is thought to result from, at the soft end (below 0.3 keV), Galactic X ray emission (the galactic X ray background), and, at the hard end (above 0.3keV), from a combination of many unresolved X ray sources outside of …   Wikipedia

• Chandra X-ray Observatory — ▪ United States satellite  U.S. satellite, one of the National Aeronautics and Space Administration (NASA) fleet of “Great Observatories” satellites, which is designed to make high resolution images of celestial X ray sources. In operation since… …   Universalium

• Timeline of astronomical maps, catalogs, and surveys — Timeline of astronomical maps, catalogs and surveys* ca. 1800 BC Babylonian star catalog * ca. 350 BC Shi Shen s star catalog has almost 800 entries * ca. 300 BC star catalog of Timocharis of Alexandria * ca. 134 BC Hipparchus makes a detailed… …   Wikipedia

• Weak gravitational lensing — While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak… …   Wikipedia