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23 relations: Astrophysical X-ray source, Calibration, Centimetre, Cosmic distance ladder, Crab Nebula, Crab Pulsar, Electronvolt, Energy, Erg, European Space Agency, Flux, Intensity (physics), Metre, Milli-, NASA, Photometry (astronomy), Photon, Second, Sky & Telescope, Space, Unit of measurement, Watt, X-ray astronomy detector.
Astrophysical X-ray source
Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays.
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Calibration
Calibration in measurement technology and metrology is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy.
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Centimetre
A centimetre (international spelling as used by the International Bureau of Weights and Measures; symbol cm) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of.
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Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.
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Crab Nebula
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant in the constellation of Taurus.
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Crab Pulsar
The Crab Pulsar (PSR B0531+21) is a relatively young neutron star.
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Electronvolt
In physics, the electronvolt (symbol eV, also written electron-volt and electron volt) is a unit of energy equal to approximately joules (symbol J).
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Energy
In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.
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Erg
The erg is a unit of energy and work equal to 10−7 joules.
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European Space Agency
The European Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation of 22 member states dedicated to the exploration of space.
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Flux
Flux describes the quantity which passes through a surface or substance.
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Intensity (physics)
In physics, intensity is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy.
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Metre
The metre (British spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI).
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Milli-
Milli- (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10−3).
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NASA
The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.
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Photometry (astronomy)
Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.
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Photon
The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).
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Second
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
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Sky & Telescope
Sky & Telescope (S&T) is a monthly American magazine covering all aspects of amateur astronomy, including the following.
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Space
Space is the boundless three-dimensional extent in which objects and events have relative position and direction.
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Unit of measurement
A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.
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Watt
The watt (symbol: W) is a unit of power.
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X-ray astronomy detector
X-ray astronomy detectors are instruments that detect X-rays for use in the study of X-ray astronomy.
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References
[1] https://en.wikipedia.org/wiki/Crab_(unit)
