Term Index (N)
- N:
- N 103B: supernova remnant in the LMC
- N 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
- N galaxy: galaxy with bright nucleus and faint surroundings
- N-body:
- N-body problem: calculating the paths of gravitationally-interacting celestial objects
- N-body simulation: simulation of many objects gravitationally-bound to each other
- N-PDF:
- N-point correlation function:
- N-point function: general term for analyses-techniques of spatial data
- N30:
- N30 Catalog: 1950s catalog collecting proper motion data from older catalogs
- N30 Catalog: 1950s catalog collecting proper motion data from older catalogs
- N500:
- NA:
- Neff:
- neutrino (ν): light, electrically neutral elementary particle
- NHe:
- NHI:
- ns:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- Na:
- NACA:
- NASA: includes space-based astronomy research
- NACO:
- nadir:
- zenith: spot on the sky directly above something
- NAI:
- NAIC:
- naked singularity:
- naked T-Tauri star:
- Namibia:
- Nançay Radio Telescope (NRT): France large single-dish radio telescope
- Nancy Grace Roman Space Telescope:
- NANOGrav: effort to detect gravitational waves through pulsar timing
- nanohertz gravitational waves: size of GWs that pulsar-timing observations might catch
- nanohertz GWs:
- nanolensing:
- nanometer:
- angstrom (Å): unit of length 10-10 meters
- nanotesla:
- tesla (T): unit of magnetic flux density
- NANTEN:
- NANTEN2: millimeter telescope in Chile
- NANTEN-2:
- NANTEN2: millimeter telescope in Chile
- NAOJ:
- NAOMI:
- Narrabri Observatory:
- Narrabri Stellar Intensity Interferometer (NSII): 1960s optical interferometer for measuring stellar diameters
- narrow band photometry:
- photometry: studying starlight through bandpass filters
- narrow emission line region:
- narrow-line AGN:
- narrow-line radio galaxy:
- narrow-line region:
- narrowband:
- bandwidth: number of hertz between minimum and maximum frequencies
- NARVAL:
- NASA: includes space-based astronomy research
- NASA Astrobiology Institute (NAI): research funding and coordination organization
- NASA Deep Space Network (NASA DSN,DSN): NASA's world-wide radio communication setup
- NASA DSN:
- NASA Flagship Program:
- HabEx: proposed space mission to directly image exoplanets
- NASA Infrared Telescope Facility:
- IRTF: Mauna Kea 3-meter infrared telescope
- NASA IRTF:
- IRTF: Mauna Kea 3-meter infrared telescope
- NASA Orbital Debris Observatory:
- NASA/IPAC Extragalactic Database (NED): a database of galaxies and other objects outside the Milky Way
- NASA/IPAC Infrared Science Archive:
- IRSA: archive center for infrared data from NASA missions
- NASDA:
- Nasmyth telescope: type of reflector telescope with secondary and tertiary mirrors
- Nasmyth-Cassegrain:
- National Advisory Committee on Aeronautics:
- NASA: includes space-based astronomy research
- National Aeronautics and Space Administration:
- NASA: includes space-based astronomy research
- National Astronomical Observatory of Japan (NAOJ): Japanese astronomy organization
- National Astronomy and Ionosphere Center:
- National Center for Atmospheric Research:
- National Center for Supercomputer Applications:
- Partiview: visualization software aimed at 4D data
- National Geographic Society-Palomar Observatory Sky Survey:
- National Oceanic and Atmospheric Administration:
- SWFO-L1: future NOAA space-weather warning satellite
- National Optical Astronomy Observatory (NOAO): past US optical astronomy organization
- National Optical-Infrared Astronomy Research Laboratory:
- NOIRLab: US optical/infrared astronomy organization
- National Radio Astronomy Observatory (NRAO): US radio astronomy organization
- National Reconnaissance Office:
- National Science Foundation:
- NSF AST: US government astronomical research funding division
- National Solar Observatory (NSO): US government sponsored solar observatory
- National Space Development Agency:
- natural astronomical telescopes: use of an astronomical body as a telescope
- natural broadening: line broadening due to uncertainty principle
- natural guide star:
- guide star (GS): star used to assist in astronomical observation
- natural laser:
- natural satellite:
- moon: a planet's natural satellite, such as Earth's
- natural units:
- Planck units: a set of units based on Planck constant and other fundamental constants
- Naval Observatory Merged Astrometric Dataset:
- NOMAD: astrometric star catalog
- Navarro-Frenk-White profile (NFW profile): a dark matter spatial mass distribution function
- Navcam:
- Navcams:
- Navier-Stokes equations (NS equations): equations that describe fluid dynamics
- Navy Optical Interferometer:
- Navy Precision Optical Interferometer (NPOI): optical interferometer in Arizona
- Navy Prototype Optical Interferometer:
- NBODY: code to carry out N-body simulations
- NBODY6:
- NBODY: code to carry out N-body simulations
- NC:
- Stardust: space mission that collected and returned comet coma dust
- NCAR:
- NCBiR:
- NCE:
- NCSA:
- Partiview: visualization software aimed at 4D data
- NDWFS:
- Ne:
- neon (Ne): element, Ne, atomic number 10
- NEA:
- NEAR:
- NEAR Shoemaker (NEAR): space mission aiming to return a sample of an asteroid
- near Earth asteroid:
- 2010 TK7: asteroid that is an Earth Trojan
- Near Earth Asteroid Rendezvous:
- NEAR Shoemaker (NEAR): space mission aiming to return a sample of an asteroid
- Near Earth Asteroid Rendezvous Schoemaker:
- NEAR Shoemaker (NEAR): space mission aiming to return a sample of an asteroid
- Near Earth Object WISE:
- Near Earth Space Surveillance:
- NEOSSat: small spacecraft tracking NEOs
- near infrared (NIR,near-IR): electromagnetic radiation in the range of 800-2500 nm
- Near Infrared Planet Searcher:
- NIRPS: near-infrared extension to HARPS spectrograph
- NEAR Shoemaker (NEAR): space mission aiming to return a sample of an asteroid
- near ultraviolet:
- optics: science and technology regarding visible light
- ULTRASAT: plan for a satellite to detect UV transients
- ultraviolet (UV): electromagnetic radiation, wavelength 10-400 nm
- near-Earth asteroid:
- Near-Earth Asteroid Tracking:
- near-Earth object (NEO): object orbiting the Sun that passes close to Earth
- 101955 Bennu: near-Earth asteroid that is the target of a sample-return mission
- Near-Earth Object Camera:
- NEOSM: planned space observatory to detect and monitor NEOs
- Near-Earth Object Surveillance Mission:
- NEOSM: planned space observatory to detect and monitor NEOs
- Near-Earth Object Surveillance Satellite:
- NEOSSat: small spacecraft tracking NEOs
- near-Earth objects:
- near-Earth supernova: supernova near enough to Earth to affect it
- Near-infrared Echelle for Wide-band Spectroscopy:
- NEWS: planned near-infrared spectrometer on Discovery Channel Telescope
- near-IR:
- near infrared (NIR,near-IR): electromagnetic radiation in the range of 800-2500 nm
- near-UV:
- ultraviolet (UV): electromagnetic radiation, wavelength 10-400 nm
- nearby star:
- Nearby Supernova Factory (NSNF,SNfactory): survey that scanned transient data for supernovae
- NEAT:
- nebula: cloud of dust and gas
- nebulae:
- nebular hypothesis: model positing solar system planets result from a solar disk
- nebular line:
- forbidden line: lines that quantum mechanics disallows for the most part
- nebular shock:
- chondrite: stony meteorites showing no melting
- NED:
- negative feedback:
- negative gravity anomaly:
- gravity anomaly: difference between measured gravity and that predicted by a model
- negative-pressure vacuum energy density:
- inflation: theorized rapid expansion of the very early universe
- Neil Gehrels Swift Observatory:
- Swift: satellite for studying gamma-ray bursts
- NEL:
- NEL region:
- NEMESIS:
- NEMP:
- carbon star (C): star with more carbon than oxygen in its atmosphere
- NEO:
- NEOCam:
- NEOSM: planned space observatory to detect and monitor NEOs
- neodymium:
- neon (Ne): element, Ne, atomic number 10
- neon burning: fusion reaction starting with neon
- neon-burning shell:
- NEOS:
- NEOSSat: small spacecraft tracking NEOs
- NEOSM: planned space observatory to detect and monitor NEOs
- NEOSSat: small spacecraft tracking NEOs
- NEOWISE:
- NEP:
- Neptune: outer-most solar system planet
- ethylene (C2H4): compound of two carbon and four hydrogen atoms
- giant planet: planet of more than 10 Earth masses
- ice giant: planet more massive than gas planets and less than rocky planets
- ring system: disk or set of rings orbiting a planet
- shepherd moon: small moon at outer edge of a ring
- Triton: Neptune's one significant moon
- Voyager: space probes to observe planets and the edge of the solar system
- Neptune I:
- Triton: Neptune's one significant moon
- Neptune Trojan:
- Neptunes:
- Nessie: star forming filament found in the Orion star forming region
- Nessie Nebula:
- Nessie: star forming filament found in the Orion star forming region
- Netherlands:
- Netherlands Institute for Radio Astronomy:
- Netherlands Organisation for Scientific Research:
- ASTRON: Netherlands radio astronomy research organization
- neural network:
- neuron:
- neutral:
- neutral atom:
- ion: non-neutral atom or molecule, with missing or extra electrons
- state of ionization: difference in an ion's electron count versus proton count
- neutral atomic hydrogen (HI,H I): state of hydrogen when sufficiently cool
- neutral tail:
- comet: Sun-orbiting object with coma and possible tail
- neutralino: proposed type of particle that might include wimps
- dark matter: matter suggested by gravity in galaxies and galaxy clusters
- neutrino (ν): light, electrically neutral elementary particle
- dark matter: matter suggested by gravity in galaxies and galaxy clusters
- particle: very small thing
- supersymmetry (SUSY): extension to standard model of particle physics
- WIMP: proposed particle comprising dark matter
- neutrino astronomy:
- neutrino (ν): light, electrically neutral elementary particle
- neutrino cooling:
- neutrino (ν): light, electrically neutral elementary particle
- neutrino decoupling:
- decoupling: some type of particle stops being destroyed as often as it is created
- neutrino detector:
- neutrino family:
- neutrino (ν): light, electrically neutral elementary particle
- neutrino flavor:
- neutrino (ν): light, electrically neutral elementary particle
- neutrino oscillation:
- neutrino species:
- neutrino (ν): light, electrically neutral elementary particle
- neutrinos:
- neutron:
- baryon: protons, neutrons, and other three-quark particles
- particle: very small thing
- quark: type of elementary particle incorporated in protons and neutrons
- quark matter (QM): matter not made of protons and neutrons but of quarks
- standard model: model of elementary particles including quarks
- neutron capture: combination of an atomic nucleus and a neutron
- neutron degeneracy pressure:
- electron degeneracy: electrons set free of atoms by the Pauli exclusion principle
- neutron star (NS): stellar remnant consisting entirely of solar masses of neutrons
- neutron degenerate matter: matter made up primarily of neutrons
- neutron drip: neutrons exiting from nuclei
- neutron heavy:
- neutron lifetime:
- neutron matter:
- neutron scattering: scattering of neutrons by atomic nuclei
- neutron spectrograph:
- neutron spectrometer: device determining the energy of received free neutrons
- neutron spectroscopy:
- neutron star (NS): stellar remnant consisting entirely of solar masses of neutrons
- Black Widow Pulsar (B1957+20, PSR J1959+2048, PSR B1957+20): binary system consisting of a pulsar and small companion
- Hulse-Taylor Binary (PSR B1913+16,PSR J1915+1606, PSR 1913+16): binary system consisting of a pulsar and neutron star
- J1713-0747: binary system with millisecond pulsar and white dwarf
- PSR 1257+12: pulsar with first discovered planet system
- SGR J1745-2900: magnetar orbiting the Milky Way SMBH
- neutron star binary:
- Neutron Star Interior Composition Explorer:
- NICER: space X-ray mission specifically to view neutron stars
- neutron star kick:
- neutron star matter:
- neutron star merger: two neutron stars meeting and forming one
- binary neutron star (BNS,NSB,DNS): two neutron stars co-orbiting
- GW170817: 2017 gravitational wave detection from a neutron star merger
- standard siren: transient whose gravitational waves indicate a specific distance
- neutron stars:
- neutronization: an electron and proton combining to form a neutron
- neutrons from carbon-13: process by which neutrons are freed in the s process
- NeVe:
- New:
- New Catalogue of Suspected Variable Stars (NSV): catalog from latter half of 20th century catalog
- New Frontiers:
- CAESAR: planned space mission to return a sample of a comet
- Dragonfly: plan for Titan flying rover
- Enceladus Life Finder (ELF): mission to search for life on Saturn moon Enceladus
- Juno: mission to Jupiter
- New Horizons (NF1): explorer spaceship sent to Pluto
- OSIRIS-REx: space mission aiming to return a sample of an asteroid
- New Frontiers 1:
- New Frontiers 2:
- New Frontiers 3:
- OSIRIS-REx: space mission aiming to return a sample of an asteroid
- New Frontiers 4:
- New Frontiers Program:
- NASA: includes space-based astronomy research
- New General Catalogue (NGC): 1888 catalog of galaxies, star clusters, and other nebulae
- New general catalogue of double stars within 120° of the North pole.:
- New General Catalogue of Nebulae and Clusters of Stars:
- New Gravitational Wave Observatory (NGO): past proposal for space mission to detect gravitational waves
- New Horizons (NF1): explorer spaceship sent to Pluto
- New Jersey:
- CAPMAP: early 2000s array that surveyed CMB polarization
- New Luyten Two-Tenths Arcsecond Catalog:
- New Mexico:
- new Moon:
- earthshine: reflected and emitted electromagnetic radiation from Earth
- New South Wales:
- SkyMapper: automated 1.35 m optical telescope in Australia
- New Technology Telescope (NTT): 3.58-meter reflector telescope in Chile
- New Worlds Mission: plan for space occulter to facilitate the view of exoplanets
- New X-ray Telescope:
- ASTRO-H: Japanese space X-ray telescope
- New Zealand:
- MOA: search for microlensing events
- NEWS: planned near-infrared spectrometer on Discovery Channel Telescope
- newton:
- joule (J): SI unit of energy
- tesla (T): unit of magnetic flux density
- Newton's first law:
- Newton's law of gravitation:
- Newton's laws: physical laws of dynamics and gravitation
- Newton's laws of motion:
- Newton's second law:
- Newton's third law:
- Newtonian gravitational constant:
- Newtonian gravitational field:
- Newtonian gravity:
- Newtonian mechanics:
- Newtonian telescope: type of reflector telescope
- NeXT:
- ASTRO-H: Japanese space X-ray telescope
- Next Generation Space Telescope:
- Next Generation Very Large Array (ngVLA): planned radio telescope array as a follow-on to ALMA and the Jansky VLA
- Next-generation Transit Survey:
- NGTS: survey of transits from Chile
- NF1:
- NF2:
- NF3:
- OSIRIS-REx: space mission aiming to return a sample of an asteroid
- NF4:
- nFLASH:
- NFW profile:
- NG:
- NGTS: survey of transits from Chile
- non-Gaussian (NG): something requiring adjustment from the gaussian function
- NGC:
- NGC 104:
- NGC 147:
- NGC 1555:
- T Tauri: variable star taken as example of young star
- NGC 1600: elliptical galaxy with supermassive black hole
- NGC 185:
- NGC 1866: globular cluster of interest in the LMC
- NGC 1952:
- NGC 1976:
- Orion Nebula (M42, NGC 1976): easily observed nebula that includes SF regions
- NGC 224:
- Andromeda (M31): spiral galaxy in the Local Group
- NGC 2363: low-metallicity SF region
- NGC 2366:
- NGC 253: spiral galaxy 11 million light-years away
- NGC 2736:
- NGC 2770: spiral galaxy 88 million light-years away
- NGC 3031:
- NGC 3034:
- NGC 3201: globular cluster in which a black hole has been identified
- NGC 3314: a pair of galaxies aligned with us
- NGC 346: open cluster in SMC
- NGC 4258:
- NGC 4321:
- Messier 100 (M100,NGC 4321): easily observed spiral galaxy
- NGC 4374:
- NGC 4486:
- M87: supergiant elliptical galaxy in local universe
- NGC 4594:
- NGC 4736:
- NGC 4826:
- NGC 4945:
- NGC 4993:
- GW170817: 2017 gravitational wave detection from a neutron star merger
- NGC 5128:
- NGC 5139:
- NGC 5194:
- NGC 5236:
- NGC 5457:
- NGC 5548:
- NGC 5866:
- Spindle Galaxy (NGC 5866): striking spiral galaxy with very large bulge
- NGC 598:
- NGC 628:
- Messier 74 (M74,NGC 628): easily observed spiral galaxy
- NGC 6822:
- NGC 6946: face-on spiral galaxy
- NGC 7078:
- Messier 15 (M15): globular cluster with collapsed core
- NGC2000.0:
- NGIMS:
- MAVEN: Mars orbiter to study its atmosphere
- NGO:
- NGS:
- NGS-POSS:
- NGST:
- NGTS: survey of transits from Chile
- ngVLA:
- NH3:
- ammonia (NH3): particular compound of nitrogen and hydrogen
- NHI:
- NHICAT:
- HIPASS: HI survey carried out 1997 to 2002
- NHO:
- NI:
- nickel (Ni): metal, Ni, atomic number 28
- nitrogen (N): metal, N, atomic number 7
- Nice model: model of the evolution of the solar system
- NICER: space X-ray mission specifically to view neutron stars
- Nicholas U. Mayall Telescope:
- NICI:
- nickel (Ni): metal, Ni, atomic number 28
- r-process: synthesization of elements through neutron capture faster than beta decay
- nickel-56:
- nickel (Ni): metal, Ni, atomic number 28
- nickel-58:
- nickel (Ni): metal, Ni, atomic number 28
- nickel-62:
- nickel (Ni): metal, Ni, atomic number 28
- NICMOS:
- NICMOS3:
- NICS:
- NIFS:
- night sky:
- light pollution: light from cities that interferes with astronomical observation
- visible light: electromagnetic radiation, wavelength 390-750 nm
- nightglow:
- airglow: glow from a planet's atmosphere
- NIHTS:
- NII:
- nitrogen (N): metal, N, atomic number 7
- STARFIRE: planned balloon-borne 2.5 m telescope and spectroscope
- NIII:
- NIMS:
- Galileo: circa 1990s space mission to Jupiter
- NIR:
- near infrared (NIR,near-IR): electromagnetic radiation in the range of 800-2500 nm
- NIRC:
- NIRC-2:
- NIRC2:
- PALMS: survey to find exoplanets for direct imaging
- NIRCam:
- NIRES:
- NIRI:
- NIRISS:
- NIRISS SOSS:
- NIRPS: near-infrared extension to HARPS spectrograph
- NIRSPEC:
- NIRSpec G395:
- NIS:
- NEAR Shoemaker (NEAR): space mission aiming to return a sample of an asteroid
- NISP:
- Euclid: planned survey observatory-satellite to measure dark energy
- NISTAR:
- nitrite (NO2-): ion of a nitrogen atom and two oxygen atoms with extra electron
- nitrite salt:
- nitrite (NO2-): ion of a nitrogen atom and two oxygen atoms with extra electron
- nitrogen (N): metal, N, atomic number 7
- amine: type of compound containing nitrogen
- ammonia (NH3): particular compound of nitrogen and hydrogen
- hydrogen cyanide (HCN): compound of hydrogen, carbon, and nitrogen, one atom each
- nitrite (NO2-): ion of a nitrogen atom and two oxygen atoms with extra electron
- nitrogen dioxide:
- nitrite (NO2-): ion of a nitrogen atom and two oxygen atoms with extra electron
- nitrogen-enhanced metal-poor star:
- carbon star (C): star with more carbon than oxygen in its atmosphere
- nitrogen-rich Wolf-Rayet:
- NIVR:
- IRAS: 1983 satellite that surveyed the sky in infrared
- Nix:
- Haumea: dwarf planet discovered in 2004
- Pluto: dwarf planet formerly listed as one of the nine planets
- NLAGN:
- NLR:
- NLRG:
- NLTE:
- NLTT:
- NML:
- NMS:
- Giotto: 1980s space mission carrying out a Comet Halley flyby
- no-hair theorem: proposition that a black hole only has mass, rotation, and charge
- NO2:
- nitrite (NO2-): ion of a nitrogen atom and two oxygen atoms with extra electron
- NO2-:
- nitrite (NO2-): ion of a nitrogen atom and two oxygen atoms with extra electron
- NOAA:
- MarsWRF: Mars-oriented general circulation model
- SWFO-L1: future NOAA space-weather warning satellite
- NOAO:
- NOAO Deep Wide-field Survey (NDWFS): survey investigating large scale structure of the universe
- noble gas:
- NOEMA:
- NOFS:
- NOIRLab: US optical/infrared astronomy organization
- noise:
- noise power:
- noise temperature: a measure of noise in electronic devices
- noise-equivalent power (NEP): signal power that equals the noise
- NOMAD: astrometric star catalog
- NOMAD1:
- NOMAD: astrometric star catalog
- non chemical equilibrium:
- non local thermodynamic equilibrium:
- non-baryonic matter:
- baryon: protons, neutrons, and other three-quark particles
- baryonic matter: ordinary matter made up of protons and neutrons
- dark matter: matter suggested by gravity in galaxies and galaxy clusters
- non-CE:
- non-condensing gas:
- non-Gaussian (NG): something requiring adjustment from the gaussian function
- non-Gaussianity:
- non-Gaussian (NG): something requiring adjustment from the gaussian function
- non-inertial reference frame:
- non-integrated Sachs-Wolfe effect:
- non-LTE:
- non-metal:
- helium (He): non-metallic element, He, atomic number 2
- hydrogen (H): most prominent element, atomic number 1
- non-Planckian:
- non-relativistic speed:
- relativistic speed: a substantial fraction of the speed of light
- relativity: physics models accommodating the constancy of the speed of light
- non-standard cosmologies:
- non-thermal emission: EMR not due to a body's heat
- non-thermal escape:
- non-thermal radiation:
- nonbaryonic matter:
- baryon: protons, neutrons, and other three-quark particles
- baryonic matter: ordinary matter made up of protons and neutrons
- noncollisional:
- nondimensionalization: manipulation of an equation to remove dimensions
- nonlinear GW memory:
- nonparametric model: model developed avoiding assumptions regarding a basic structure
- nonsingular black hole model:
- Nordic Optical Telescope:
- Norma Arm:
- spiral arm: long, winding visible structure within a spiral galaxy
- Norma-Cygnus Arm:
- spiral arm: long, winding visible structure within a spiral galaxy
- normal color index:
- color index: a number that characterizes the color of an object
- normal distribution:
- normal elastic thickness:
- elastic thickness (Te): measure of the thickness of a sagging layer of a planet surface
- normal mode: sinusoidal oscillation, such as in seismology
- eigenmode: vibration mode of an oscillator where all parts move at the same frequency
- normalization constant:
- normalized PDF:
- normalized PMF:
- normalizing constant:
- North American Nanohertz Observatory for Gravitational Waves:
- NANOGrav: effort to detect gravitational waves through pulsar timing
- north galactic pole:
- galactic north: determination of the more northern direction of the Milky Way's axis
- north node:
- north polar sequence (NPS): set of stars previously used to define magnitudes
- Northern Cross Radio Telescope:
- Northern Extended Millimeter Array (NOEMA): large radio telescope array under construction in Europe
- Northern Hemisphere Observatory:
- northern lights:
- aurora: light produced by atmosphere and solar wind
- northern zone of avoidance:
- NOT:
- NOTSA:
- nova (N): white dwarf explosion
- nova remnant:
- NP:
- NPDF:
- NPOI:
- NPS:
- NR:
- NRAL:
- NRAO:
- NRAO Catalog (NRAO): 1960s followup to Cambridge radio surveys
- NRAO Seven-beam Receiver:
- NRAO VLA Sky Survey (NVSS): 1990s microwave survey of 82% of the sky
- NRES:
- NRL White-light Coronagraph:
- OSO 7: 1970s observatory-satellite for viewing the Sun
- NRT:
- NS:
- neutron star (NS): stellar remnant consisting entirely of solar masses of neutrons
- NS equations:
- NS kick:
- NS merger:
- NSB:
- NSF:
- LIGO: pair of observatories to detect gravitational waves
- MEarth Project (MEarth): automated observatories monitoring nearby red dwarfs for transits
- NSF AST: US government astronomical research funding division
- Two Micron All-sky Survey (2MASS): near-infrared survey of both hemispheres
- NSF AST: US government astronomical research funding division
- NSF AST MSIP:
- NSF AST: US government astronomical research funding division
- NSF Astronomical Sciences Division:
- NSF AST: US government astronomical research funding division
- NSFCam2:
- IRTF: Mauna Kea 3-meter infrared telescope
- NSII:
- NSNF:
- NSO:
- NSV:
- NTC:
- Tianwen-1 (TW-1): Mars rover/orbiter mission currently orbiting Mars
- NTT:
- NTTS:
- nuclear:
- nuclear drip line:
- nuclear energy generation rate (ε): fusion power per unit mass
- nuclear fission:
- fusion: formation of an atomic nucleus nuclei from multiple smaller nuclei
- nuclear fusion:
- fusion: formation of an atomic nucleus nuclei from multiple smaller nuclei
- nuclear isomer:
- metastable: characteristic of an excited state that lasts longer than typical
- nuclear photodissociation:
- nuclear reaction:
- nuclear reaction rate:
- Nuclear Spectroscopic Telescope Array:
- NuSTAR: space telescope for high-energy X-rays
- nuclear timescale:
- timescale (t,τ): general length of time something takes
- nucleon:
- dalton (Da,u): mass unit used on atomic scale
- element: class of atom based on its number of protons
- fusion: formation of an atomic nucleus nuclei from multiple smaller nuclei
- isotope: subclass of an element with a specific number of nucleons
- standard model: model of elementary particles including quarks
- nucleosynthesis: creation of atomic nuclei
- nucleotides:
- Lego principle: principle that life is associated with a skew in molecule abundances
- nucleus:
- comet: Sun-orbiting object with coma and possible tail
- nucleus notation:
- isotope: subclass of an element with a specific number of nucleons
- nuclide:
- Nuffield Radio Astronomy Laboratory:
- nulling:
- number density (n): number of objects per volume
- numbered object:
- numerical analysis: using equations through repetitive arithmetic
- finite difference method (FDM): means of estimating calculus and differential equation solutions
- stencil: pattern of input to numerical solutions at a point
- numerical integration:
- numerical method:
- numerical model:
- numerical relativity (NR): solving GR-sensitive problems with numerical methods
- numerical weather prediction (NWP): Earth weather prediction by computer equation-solving and/or simulation
- numerical weather prediction model:
- NuSTAR: space telescope for high-energy X-rays
- nutation: precession of a body's axis of rotation
- NUV:
- ULTRASAT: plan for a satellite to detect UV transients
- ultraviolet (UV): electromagnetic radiation, wavelength 10-400 nm
- NVSS:
- NWO:
- ASTRON: Netherlands radio astronomy research organization
- Astronet: European astronomy consortium
- NWP:
- NWP model:
- Nysa:
- NZO:
Index