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**Q:****chirp mass****(M**: a reduced-mass-like quantity that relates to gravitational waves_{c},ℳ)**critical density****(ρ**: density of the universe which leaves it flat_{c})**mass ratio****(μ,q)**: ratio of masses of two objects such as a binary star**rare designator prefixes**: designator prefixes generally used for only a few objects**Stokes parameters**: means of describing a polarization state**tidal Q**: measure of orbital energy dissipated per orbit due to tidal forces**Toomre Q parameter****(Q)**: stability criterion for differentially rotating disks

**Q band:****infrared****(IR)**: electromagnetic radiation, wavelength 0.74-300 micrometers**mid infrared****(MIR,mid-IR)**: infrared radiation with wavelengths in the 7.5-25 μm range

**Q factor**: measure of oscillator's damping**tidal Q**: measure of orbital energy dissipated per orbit due to tidal forces

**Q parameter:****Toomre Q parameter****(Q)**: stability criterion for differentially rotating disks

**Q&U Bolometric Interferometer for Cosmology:****QUBIC**: survey to measure the polarization of the CMB

**Q/U Imaging Experiment:****QUIET**: survey to measure the polarization of the CMB

**q**_{0}:**critical density****(ρ**: density of the universe which leaves it flat_{c})

**Qatar:****Qatar Exoplanet Survey****(QES)**: photometric survey in search of transients

**Qatar Exoplanet Survey****(QES)**: photometric survey in search of transients**Qatari:****Qatar Exoplanet Survey****(QES)**: photometric survey in search of transients

**QCD:****quantum field theory****(QFT)**: reworking of quantum mechanics incorporating fields**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms**quark matter****(QM)**: matter not made of protons and neutrons but of quarks

**QCD matter:****quark matter****(QM)**: matter not made of protons and neutrons but of quarks

**QE:****quantum efficiency****(QE)**: measure of instrument's ability to sense EMR

**QED:****quantum field theory****(QFT)**: reworking of quantum mechanics incorporating fields**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**QES:****Qatar Exoplanet Survey****(QES)**: photometric survey in search of transients

**QFT:****conformal field theory****(CFT)**: a type of quantum field theory**effective field theory****(EFT)**: type of useful simplification of a field theory**fuzzy dark matter****(FDM)**: concept of extremely light dark matter particles**quantum field theory****(QFT)**: reworking of quantum mechanics incorporating fields**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**QGP:****quark-gluon plasma****(QGP)**: extreme-temperature state of matter

**QM:****neutron star****(NS)**: stellar remnant consisting entirely of solar masses of neutrons**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms**quark matter****(QM)**: matter not made of protons and neutrons but of quarks

**QMAP**: mid 1990s balloon-based CMB survey**QMC:****quantum Monte Carlo****(QMC)**: MC approach to difficult quantum mechanical problems

**QN:****neutron star****(NS)**: stellar remnant consisting entirely of solar masses of neutrons

**QPO:****quasi-periodic oscillation****(QPO)**: type of flicker of some X-ray sources

**QQ:****rare designator prefixes**: designator prefixes generally used for only a few objects

**QQQ:****rare designator prefixes**: designator prefixes generally used for only a few objects

**QRFH:****quad-ridge flare horn****(QRFH)**: type of horn that can be incorporated in radio telescope feeds

**QRFH feed:****quad-ridge flare horn****(QRFH)**: type of horn that can be incorporated in radio telescope feeds

**QRO:****Queen's University Radio Observatory****(QRO)**: early radio astronomy facility near Kingston, Ontario

**QSG:****quasar****(QSO)**: distant, bright object that appears something like a star

**QSO:****quasar****(QSO)**: distant, bright object that appears something like a star

**QSO B1957+405:****Cygnus A****(3C 405,QSO B1957+405)**: early-discovered radio galaxy and quasar

**QSR:****quasar****(QSO)**: distant, bright object that appears something like a star

**QSS:****QT1:****QUIJOTE**: survey to measure the polarization of the CMB

**QT2:****QUIJOTE**: survey to measure the polarization of the CMB

**QUaD**: survey to measure the polarization of the CMB**quad-ridge flare horn****(QRFH)**: type of horn that can be incorporated in radio telescope feeds**quadrapole:****multipole expansion**: series expansion of a function over the surface of a sphere

**quadratic field strength**: a measure of a star's varying magnetic field**quadrupole:****multipole expansion**: series expansion of a function over the surface of a sphere

**quadrupole expansion:****multipole expansion**: series expansion of a function over the surface of a sphere

**quadrupole formula:****gravitational wave****(GW)**: ripples in the curvature of spacetime propagating as a wave

**quadrupole moment of mass:****gravitational wave****(GW)**: ripples in the curvature of spacetime propagating as a wave

**quality factor:****quantum**: minimal amount of something that triggers a reaction**quantum chromodynamics:****quantum field theory****(QFT)**: reworking of quantum mechanics incorporating fields**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms**quark matter****(QM)**: matter not made of protons and neutrons but of quarks

**quantum computing:****quantum**: minimal amount of something that triggers a reaction

**quantum degeneracy:****degeneracy**: general word meaning a violation of normal rules

**quantum efficiency****(QE)**: measure of instrument's ability to sense EMR**photometry**: studying starlight through bandpass filters**photomultiplier tube****(PMT)**: electronic device to detect light

**quantum electrodynamics:****quantum field theory****(QFT)**: reworking of quantum mechanics incorporating fields**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum field theory****(QFT)**: reworking of quantum mechanics incorporating fields**conformal field theory****(CFT)**: a type of quantum field theory**effective field theory****(EFT)**: type of useful simplification of a field theory**fuzzy dark matter****(FDM)**: concept of extremely light dark matter particles**quantum fluctuations**: short-lived particles popping up at random**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum fluctuation:****Hawking radiation**: EMR theorized to be emitted by black holes, powered by their mass**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum fluctuations**: short-lived particles popping up at random**black hole****(BH)**: region of such high mass that light cannot escape**cosmological simulation**: simulation of the history of the universe

**quantum gravity:****graviton**: quantum of gravity

**quantum hydrodynamics:****Madelung equations**: quantum hydrodynamic equations

**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms**amplitude**: the height of a wave**atomic excitation**: atoms with electrons above the ground state**Bose-Einstein condensate****(BEC)**: rare state of matter possible at cryogenic temperatures**Compton wavelength**: lower bound on a particle's possible de Broglie wavelength**conservation law**: property that remains unchanged by physical phenomena**Cooper pair**: pair of electrons sharing a particular type of bond**de Broglie wavelength**: wavelength of a particle's matter wave**degeneracy**: general word meaning a violation of normal rules**degeneracy weight**: number of quantum states with same energy level**degree of ionization**: fraction of material consisting of ions**electron degeneracy**: electrons set free of atoms by the Pauli exclusion principle**electron orbital**: a nucleus's "locations" where an electron can orbit**false vacuum**: apparent QM vacuum**Fermi sea**: electrons sitting at the outer edge when the atom is least excited**fine structure**: separate spectral lines due to electron spin and relativistic effects**forbidden line**: lines that quantum mechanics disallows for the most part**graviton**: quantum of gravity**Hamiltonian**: mathematical transform useful in mechanics**Heisenberg uncertainty principle**: limit on observable position and momentum of an object**hyperfine structure**: spectral lines from magnetic and spin interactions between electrons and nucleus**initial fluctuations**: early universe density variations leading to current universe**ion**: non-neutral atom or molecule, with missing or extra electrons**Madelung equations**: quantum hydrodynamic equations**metastable**: characteristic of an excited state that lasts longer than typical**oscillator strength**: fraction expressing QM's contribution to the probability of absorption**Pauli exclusion principle**: fermions in a quantum system cannot have identical quantum numbers**photon**: quantum of light, i.e., light as a particle**Planck constant****(h)**: quantum of action in quantum mechanics**plasmon**: quasiparticle that is quantum of plasma vibration**quantum**: minimal amount of something that triggers a reaction**quantum field theory****(QFT)**: reworking of quantum mechanics incorporating fields**quantum fluctuations**: short-lived particles popping up at random**quantum mixing**: means by which one particle spontaneously changes to another**quantum number**: number representing a conserved quantity**quantum system**: situation in which quantum theory applies**quantum tunneling**: quantum mechanical effect of particles passing through a barrier**quasiparticle**: disturbance that acts like a particle**relativistic effect**: a substantial fraction of the speed of light**Schrödinger equation**: quantum-mechanical wave-equation-like equation**Schrödinger-Poisson equation**: Schrödinger equation including a term for gravity**spin****(m**: an angular-momentum quantum number_{s})**standard model**: model of elementary particles including quarks**state of excitation**: energy level of something above the minimum**state of ionization**: difference in an ion's electron count versus proton count**statistical mechanics**: mechanical behavior based upon probability

**quantum mixing**: means by which one particle spontaneously changes to another**neutralino**: proposed type of particle that might include wimps**supersymmetry****(SUSY)**: extension to standard model of particle physics

**quantum Monte Carlo****(QMC)**: MC approach to difficult quantum mechanical problems**Monte Carlo method**: mathematics and simulation using random samples

**quantum number**: number representing a conserved quantity**quantum physics:****quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum scale:****quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum state:****degeneracy**: general word meaning a violation of normal rules**degeneracy weight**: number of quantum states with same energy level**partition function****(Z)**: scale factor for Boltzmann factors**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum system**: situation in which quantum theory applies**quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum theory:****quantum mechanics****(QM)**: modern mechanical theory of small things, on the scale of atoms

**quantum tunneling**: quantum mechanical effect of particles passing through a barrier**quantum tunnelling:****Heisenberg uncertainty principle**: limit on observable position and momentum of an object

**Quaoar:****Kuiper Belt****(K Belt,KB)**: further part of solar system beyond Neptune

**quark**: type of elementary particle incorporated in protons and neutrons**baryon**: protons, neutrons, and other three-quark particles**exotic star**: term for theoretical stars not made of atoms/ions**hyperon**: exotic type of baryon**particle**: very small thing**pion****(π)**: first type of meson discovered**quark matter****(QM)**: matter not made of protons and neutrons but of quarks**standard model**: model of elementary particles including quarks**supersymmetry****(SUSY)**: extension to standard model of particle physics

**quark matter****(QM)**: matter not made of protons and neutrons but of quarks**exotic star**: term for theoretical stars not made of atoms/ions**neutron degenerate matter**: matter made up primarily of neutrons**neutron star****(NS)**: stellar remnant consisting entirely of solar masses of neutrons**quark**: type of elementary particle incorporated in protons and neutrons

**quark star:****exotic star**: term for theoretical stars not made of atoms/ions**quark matter****(QM)**: matter not made of protons and neutrons but of quarks

**quark-gluon plasma****(QGP)**: extreme-temperature state of matter**quark-nova:****neutron star****(NS)**: stellar remnant consisting entirely of solar masses of neutrons

**quarter-wave plate:****waveplate**: type of optical device that alters polarization

**quasar****(QSO)**: distant, bright object that appears something like a star**quasar feedback:****star formation feedback**: mechanisms whereby star formation regulates its own rate

**quasars:****2dF-SDSS LRG and QSO survey****(2SLAQ)**: spectroscopic survey of distant galaxies**active galactic nucleus****(AGN)**: central region of a galaxy with extremely high luminosity**Baryon Oscillation Spectroscopic Survey****(BOSS)**: survey of spatial distribution of luminous red galaxies and quasars**blazar**: very compact variable quasar**broad-line region****(BLR)**: region in center of active galaxy where spectral lines are broad**Canada-France High-z Quasar Survey****(CFHQS)**: 2000s distant quasar survey**deep field****(DF)**: survey field subject to lengthy observation to identify distant galaxies**deep survey**: survey using lengthy observation to identify distant galaxies**extragalactic astronomy**: astronomy of other galaxies, galaxy clusters, AGNs, quasars, etc.**Gunn-Peterson trough**: spectral feature in EMR from redshift 6+**Hamburg/ESO Survey****(HE)**: 1990s southern hemisphere survey aimed at finding quasars**Hewitt & Burbidge Catalog****(HB87)**: optical catalog of quasi-stellar objects**Large Bright QSO Survey****(LBQS)**: 1980s quasar survey**large quasar group****(LQG)**: structure consisting of a collection of quasars**NASA/IPAC Extragalactic Database****(NED)**: a database of galaxies and other objects outside the Milky Way**Roma-BZCAT**: 2008 catalog of blazars**Second Byurakan Survey****(SBS)**: 1970s-1990s survey of galaxies and quasars**Soltan argument**: distant quasars imply SMBHs still exist**submillimeter galaxy****(SMG)**: galaxy that produces significant submillimeter radiation

**quasi-periodic oscillation****(QPO)**: type of flicker of some X-ray sources**quasi-star:****exotic star**: term for theoretical stars not made of atoms/ions

**quasi-static speckles:****speckles**: image flaws such as extraneous spots

**quasi-stellar galaxy:****quasar****(QSO)**: distant, bright object that appears something like a star

**quasi-stellar object:****quasar****(QSO)**: distant, bright object that appears something like a star

**quasi-stellar radio source:****quasar****(QSO)**: distant, bright object that appears something like a star

**quasi-stellar source:****quasar****(QSO)**: distant, bright object that appears something like a star

**quasiparticle**: disturbance that acts like a particle**QUBIC**: survey to measure the polarization of the CMB**Queen's University At Kingston:****Queen's University Radio Observatory****(QRO)**: early radio astronomy facility near Kingston, Ontario

**Queen's University Radio Observatory****(QRO)**: early radio astronomy facility near Kingston, Ontario**quench:****star formation****(SF)**: theorized collapse of gas and dust into stars

**quenched galaxy**: galaxy currently producing minimal stars**quenching:****quenched galaxy**: galaxy currently producing minimal stars

**QUEST**: sixteen square-degree survey camera**LaSilla-QUEST Variability Survey****(LSQ)**: survey for transients

**QUEST at DASI:****QUaD**: survey to measure the polarization of the CMB

**quiescent:****star formation****(SF)**: theorized collapse of gas and dust into stars**starburst galaxy**: galaxy forming stars at a very high rate

**quiescent BHB:****black hole binary****(BHB)**: binary star in which one is a stellar black hole

**quiescent galaxy:****starburst galaxy**: galaxy forming stars at a very high rate

**quiescent phase:****symbiotic binary****(SS)**: giant star transferring mass to a somewhat distant companion

**quiescent state:****stellar flare**: sudden brightening of a star

**QUIET**: survey to measure the polarization of the CMB**quiet BHB:****black hole binary****(BHB)**: binary star in which one is a stellar black hole

**QUIJOTE**: survey to measure the polarization of the CMB**QUIJOTE-CMB Telescopes:****QUIJOTE**: survey to measure the polarization of the CMB