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- NadirDirection pointing directly below a particular location
- Nadir and Occultation for Mars DiscoveryNadir and Occultation for MArs Discovery (NOMAD) is a 3-channel spectrometer on board the
- Naiad (moon)Naiad , (also known as Neptune III and previously designated as S/1989 N 6) named after th
- Naked eyeHuman vision, unaided by optical instruments
- NakhliteNakhlites are a group of Martian meteorites, named after the first one, Nakhla meteorite.
- NameExoWorldsNameExoWorlds (also known as IAU NameExoWorlds) is the name of various projects managed by
- Naming of cometsComets have been observed for over 2,000 years. During that time, several different system
- Naming of moonsThe naming of moons has been the responsibility of the International Astronomical Union's
- Nancy Grace Roman Space TelescopeNASA infrared space telescope launched in 2026
- Nancy HoukNancy Houk is an American astronomer who led the effort to establish a comprehensive datab
- NASA Astrobiology InstituteThe NASA Astrobiology Institute (NAI) was established in 1998 by the National Aeronautics
- NASA Authorization Act of 2005The NASA Authorization Act of 2005 is an act of the United States Congress that requires N
- NASA Exoplanet ArchiveOnline astronomical exoplanet catalog and data service
- NASA/IPAC Extragalactic DatabaseAstronomical database
- Natal astrologyForm of astrology based on time of birth
- Natascha Förster SchreiberCanadian-German astronomer
- National Radio Astronomy ObservatoryThe National Radio Astronomy Observatory (NRAO) is a federally funded research and develop
- National Space Development Agency of JapanThe National Space Development Agency of Japan (宇宙開発事業団, Uchū Kaihatsu Jigyōdan), or NASDA
- Natural satelliteAstronomical body that orbits a planet
- Naval District WashingtonThe Naval District Washington is one of eleven current naval regions responsible to Comman
- Near side of the MoonHemisphere of the Moon facing the Earth
- Near-Earth Asteroid TrackingProgram to discover near-Earth objects
- Near-Earth objectSmall Solar System body with an orbit that can bring it close to Earth
- Near-infrared spectroscopyAnalytical method
- NebulaBody of interstellar clouds
- Nebular hypothesisAstronomical theory about the Solar System
- Neil GehrelsAmerican astrophysicist (1953–2017)
- Nemesis (hypothetical star)Hypothetical star orbiting the Sun, supposedly responsible for extinction events
- Neon-burning processThe neon-burning process is a set of nuclear fusion reactions that take place in evolved m
- NeptuneEighth planet from the Sun
- Neptune in fictionDepictions of the planet
- Neptune trojanAsteroid sharing the orbit of Neptune
- Neutrino astronomyObserving low-mass stellar particles
- Neutrino decouplingIn Big Bang cosmology, neutrino decoupling was the epoch at which neutrinos ceased interac
- Neutrino detectorPhysics apparatus designed to study neutrinos
- Neutron starCollapsed core of a massive star
- Neutron star mergerType of stellar collision
- Neverland RegioNorth polar dark region on Charon
- New Frontiers programSeries of space exploration missions being conducted by NASA
- New General CatalogueAstronomical catalogue of deep sky objects
- New moonFirst lunar phase, the definition varies
- New Technology TelescopeAstronomical telescope in Chile
- Newton (lunar crater)Newton is a lunar impact crater located near the south limb of the Moon. It is south-south
- NGC 1049NGC 1049 is a globular cluster located in the Local Group galaxy of the Fornax Dwarf, visi
- NGC 1055NGC 1055 is an edge-on spiral galaxy located in the constellation Cetus. The galaxy has a
- NGC 1275Seyfert galaxy in the constellation Perseus
- NGC 1277NGC 1277 is a lenticular galaxy in the constellation of Perseus. It is a member of the Per
- NGC 1333NGC 1333 is a reflection nebula located in the northern constellation Perseus, positioned
- NGC 1407NGC 1407 is an elliptical galaxy in Eridanus. It is at a distance of 76 million light-year
- NGC 1427ANGC 1427A, also known as ESO 358-49, or ESO 358- G 049, is an irregular galaxy in the cons
- NGC 1435The Merope Nebula (also known as Tempel's Nebula and NGC 1435) is a diffuse reflection neb
- NGC 185NGC 185 (also known as Caldwell 18) is a dwarf spheroidal galaxy located 2.08 million ligh
- NGC 188NGC 188 (also known as Caldwell 1 or the Polarissima Cluster) is an open cluster in the co
- NGC 2035NGC 2035 (also known as ESO 56-EN161 and the Dragon's Head Nebula) is an emission nebula a
- NGC 2070NGC 2070 (also known as Caldwell 103) is a large open cluster and candidate super star clu
- NGC 2281NGC 2281, also known as the Broken Heart Cluster, is an open cluster of stars in the north
- NGC 2362NGC 2362, also known as Caldwell 64, is an open cluster of stars in the southern constella
- NGC 2419NGC 2419 (also known as Caldwell 25) is a globular cluster in the constellation Lynx. It w
- NGC 2998NGC 2998 is a barred spiral galaxy located in the constellation Ursa Major. It is 195 mill
- NGC 3293NGC 3293 is an open cluster in the Carina constellation. It was discovered by Nicolas-Loui
- NGC 3324NGC 3324 is an open cluster in the southern constellation Carina, located northwest of the
- NGC 4151Galaxy in the constellation Canes Venatici
- NGC 4217NGC 4217 is an edge-on spiral galaxy which lies approximately 60 million light-years (18 m
- NGC 4452NGC 4452 is an edge-on lenticular galaxy that is part of the Virgo Cluster. NGC 4452 is ab
- NGC 45NGC 45 is a low surface brightness spiral galaxy in the equatorial constellation of Cetus.
- NGC 4603NGC 4603 is a spiral galaxy located about 107 million light years away in the constellatio
- NGC 4914Galaxy in the constellation Canes Venatici
- NGC 4945Galaxy in the constellation Centaurus
- NGC 4993Galaxy in the constellation of Hydra
- NGC 5315NGC 5315 is a planetary nebula in the southern constellation Circinus. Of apparent magnitu
- NGC 5371NGC 5371 is a face-on spiral galaxy in the northern constellation Canes Venatici. It was d
- NGC 5548Type I Seyfert galaxy in the constellation Boötes
- NGC 5585NGC 5585 is a spiral galaxy located about 28 million light-years away from Earth in the co
- NGC 6025NGC 6025 is an open cluster of stars in the southern constellation of Triangulum Australe,
- NGC 604NGC 604 is an H II region inside the Triangulum Galaxy. It was discovered by William Hersc
- NGC 6041NGC 6041 is a giant elliptical galaxy located about 470 million light-years away in the co
- NGC 6302Bipolar planetary nebula in the constellation Scorpius
- NGC 6326NGC 6326 is a complex and irregularly structured planetary nebula located in the constella
- NGC 6621NGC 6621 is an interacting spiral galaxy in the constellation Draco. It lies at a distance
- NGC 6742NGC 6742 (also known as Abell 50) is a planetary nebula in the constellation Draco. NGC 67
- NGC 6752NGC 6752 (also known as Caldwell 93 and nicknamed the Great Peacock Globular) is a globula
- NGC 6946Galaxy in the constellations Cepheus & Cygnus
- NGC 7027Planetary nebula in the constellation Cygnus
- NGC 7209NGC 7209 is an open cluster in the constellation Lacerta. It was discovered by William Her
- Nice modelScenario for the dynamical evolution of the Solar System
- Nicholas B. SuntzeffAmerican astronomer and cosmologist
- Nick KaiserNicholas Kaiser FRS (15 September 1954 – 13 June 2023) was a British cosmologist. He is th
- Nicolas-Claude Fabri de PeirescNicolas-Claude Fabri de Peiresc (1 December 1580 – 24 June 1637), often known simply as Pe
- NightPeriod of darkness
- Night skyAppearance of the sky in a clear night
- NIRCamImaging instrument aboard the James Webb Space Telescope
- Nix (moon)Moon of Pluto
- Noachis quadrangleMap of Mars
- Noctis LabyrinthusLabyrinthus on Mars
- Noon12 o'clock in the daytime
- Norma (constellation)Constellation in the southern celestial hemisphere
- Northern celestial hemisphereNorthern half of the celestial sphere
- NovaNuclear explosion in a white dwarf star
- Nova remnantA nova remnant is made up of the material either left behind by a sudden explosive fusion
- Nu FornacisNu Fornacis, Latinized from ν Fornacis, is a single, variable star in the southern constel
- Nu PhoenicisNu Phoenicis is a F-type main-sequence star in the southern constellation of Phoenix. It i
- NutationWobble of the axis of rotation
- Nysa–Polana complexGroup of overlapping asteroid families
