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This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a ...
ICRF – (astrophysics terminology) International Celestial Reference Frame, a coordinate system based on radio sources used to define the locations of objects in the sky; ICRS – (astrophysics terminology) International Celestial Reference System, a coordinate system based on Hipparcos observations used to define the locations of objects in ...
The term is derived from the Greek word anemos, which means wind, and is used to describe any wind speed instrument used in meteorology. Angle of attack – In fluid dynamics , angle of attack ( AOA , or α {\displaystyle \alpha } ) is the angle between a reference line on a body (often the chord line of an airfoil ) and the vector representing ...
Term Notes M medium Wake turbulence category: MAC mean aerodynamic chord: MAC mid-air collision: MAHF Missed Approach Holding Fix Used in RNAV MANAB Manual of Word Abbreviations [15] Used in Canada MAP manifold absolute pressure: MAP missed approach point Or: MAPt. Instrument approach. MAPS Minimum Aviation Performance Standards MATS
The term exobiology is similar. [ 79 ] Astrobiology makes use of molecular biology , biophysics , biochemistry , chemistry , astronomy, physical cosmology , exoplanetology and geology to investigate the possibility of life on other worlds and help recognize biospheres that might be different from that on Earth. [ 80 ]
The total wave functions are in the tensor product space of the Hilbert space of the spatial part (which is spanned by the position eigenstates) and the Hilbert space for the spin. Wave function The word "wave function" could mean one of following: A vector in Hilbert space which can represent a state; synonymous to "ket" or "state vector".
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In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...