cosmic ray astronomy

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• Cosmic ray visual phenomena — Cosmic ray visual phenomena, also referred to as phosphenes or light flashes , are spontaneous flashes of light visually perceived by astronauts outside the magnetosphere of the Earth, such as during the Apollo program. Researchers believe that… …   Wikipedia

• Cosmic-ray observatory — A cosmic ray observatory is a scientific installation built to detect high energy particles coming from space called cosmic rays. This typically includes photons (high energy light), electrons, protons, and some heavier nuclei, as well as… …   Wikipedia

• X-ray astronomy — X rays start at 0.008 nm and extend across the electromagnetic spectrum to 8 nm, over which the Earth s atmosphere is opaque. X ray astronomy is an observational branch of astronomy which deals with the study of X ray observation and detection… …   Wikipedia

• Gamma-ray astronomy — is the astronomical study of the cosmos with gamma rays. Early history Long before experiments could detect gamma rays emitted by cosmic sources, scientists had known that the universe should be producing these photons. Work by Eugene Feenberg… …   Wikipedia

• Ultra-high-energy cosmic ray — Unsolved problems in physics Why is it that some cosmic rays appear to possess energies that are theoretically too high? In high energy physics, an ultra high energy cosmic ray (UHECR) or extreme energy cosmic ray (EECR) is a cosmic ray with an… …   Wikipedia

• Extragalactic cosmic ray — Extragalactic cosmic rays are very high energy particles that flow into our solar system from beyond our galaxy. The energies these particles possess are in excess of 1015 eV. Origin Unlike solar or galactic cosmic rays, little is known about the …   Wikipedia

• x-ray astronomy — x ray astronomer. the branch of astronomy that studies celestial objects by means of the x rays emitted by them. Cf. x ray (def. 1b). [1960 65] * * * Study of astronomical objects and phenomena that emit radiation at X ray wavelengths. Because… …   Universalium

• Astronomy — (from the Greek words astron (ἄστρον), star , and nomos (νόμος), law ) is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earth s atmosphere (such as the cosmic… …   Wikipedia

• Ray — /ray/ for 1, 2, 4, 5; /ruy/ for 3, n. 1. John, 1627? 1705, English naturalist. 2. Man /man/, 1890 1976, U.S. painter and photographer. 3. Satyajit /sut yeuh jit/, 1921 92, Indian film director. 4. a male given name, form of Raymond …   Universalium

• astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… …   Universalium

• ray — ray1 raylike, adj. /ray/, n. 1. a narrow beam of light. 2. a gleam or slight manifestation: a ray of hope. 3. a raylike line or stretch of something. 4. light or radiance. 5. a line of sight. 6. Physics, Optics. a …   Universalium