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source-object distance

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  • Distance modulus — The distance modulus is a way of expressing distances that is often used in astronomy. Contents 1 Definition 2 Different kinds of distance moduli 3 Usage 4 References …   Wikipedia

  • Point source — For other uses, see Point source (disambiguation). A point source is a single identifiable localized source of something. A point source has negligible extent, distinguishing it from other source geometries. Sources are called point sources… …   Wikipedia

  • Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …   Wikipedia

  • Action at a distance (computer science) — Action at a distance is an anti pattern (a recognized common error) in which behavior in one part of a program varies wildly based on difficult or impossible to identify operations in another part of the program.The way to avoid the problems… …   Wikipedia

  • Foreign object damage — FOD to the compressor blades of a Honeywell LTS101 turboshaft engine on a Bell 222, caused by a small bolt that passed through the protective inlet screen …   Wikipedia

  • DART ion source — A capsule being analyzed is held in the sample chamber between the DART ion source (right) and the spectrometer inlet (cone on left). DART (Direct Analysis in Real Time) is an atmospheric pressure ion source that instantaneously ionizes gases,… …   Wikipedia

  • radio source — Astron. a cosmic object or phenomenon, as a galaxy, pulsar, quasar, or the remnant of a supernova or of a galactic collision, that emits radio waves. [1945 50] * * * ▪ astronomy       in astronomy, any of various objects in the universe that emit …   Universalium

  • Lunar distance (navigation) — For the history of the lunar distance method, see History of longitude. Finding Greenwich time while at sea using a lunar distance. The Lunar Distance is the angle between the Moon and a star (or the Sun). The altitudes of the two bodies are used …   Wikipedia

  • Identified flying object — An Identified Flying Object, or IFO, is any unusual or puzzling object or optical phenomenon observed in the sky which has been identified as a known or conventional phenomenon after being investigated by qualified persons. This is in contrast to …   Wikipedia

  • Stopping sight distance — is a term used in highway design. It is defined as the length of roadway ahead visible to the driver. American Association of State Highway and Transportation Officials (1994) A Policy on Geometric Design of Highways and Streets (pp. 117 118)]… …   Wikipedia

  • ceremonial object — ▪ religion Introduction  any object used in a ritual or a religious ceremony.       Throughout the history of religions and cultures, objects used in cults, rituals, and sacred ceremonies have almost always been of both utilitarian and symbolic… …   Universalium

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