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- L dwarfAstronomical objects colder than red dwarfs
- L-type asteroidL-type asteroids are relatively uncommon asteroids with a strongly reddish spectrum shortw
- La Silla ObservatoryAstronomical observatory in Chile
- LacertaConstellation in the northern celestial hemisphere
- Lada TerraLada Terra, named for a Slavic goddess of Love, is a major landmass near the south pole of
- Lagoon NebulaEmission nebula in Sagittarius
- Lagrange pointEquilibrium points near two orbiting bodies
- Lakes and rivers of TitanHydrocarbon lakes on Titan, a moon of Saturn
- Lakes on MarsFormer bodies of water on Mars
- Lambda Boötis starA Lambda Boötis star is a type of chemically peculiar star which has an unusually low abun
- Lambda CentauriLambda Centauri, Latinized from λ Centauri, is a star in the southern circumpolar constell
- Lambda Eridani variableA Lambda Eridani Variable is a class of Be stars that show small amplitude variations of a
- Lambda GeminorumLambda Geminorum, Latinized from λ Geminorum, is a candidate multiple star system in the c
- Lambda TauriLambda Tauri (λ Tau, λ Tauri) is a triple star system in the constellation Taurus. In the
- Lambda-CDM modelMathematical model of the Big Bang
- Lambertian reflectanceLambertian reflectance is the property that defines an ideal "matte" or diffusely reflecti
- LAMOSTThe Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), also known as the
- Lander (spacecraft)Type of spacecraft
- Laniakea SuperclusterBasin of attraction home to the Milky Way
- Laplace planeThe Laplace plane or Laplacian plane of a planetary satellite, named after its discoverer
- Large Magellanic CloudSatellite galaxy of the Milky Way
- Large quasar groupLarge astronomical structure
- Large-scale structure of the universeConcept in cosmology
- Las Campanas ObservatoryLas Campanas Observatory (LCO) is an astronomical observatory managed by the Carnegie Inst
- Latinisation of namesPractice of rendering a non-Latin name in a Latin style
- Laura P. BautzAmerican astronomer
- Lawrence H. AllerAmerican astronomer (1913–2003)
- Lawrence Parsons, 2nd Earl of RosseLawrence Parsons, 2nd Earl of Rosse (21 May 1758 – 24 February 1841), known as Sir Lawrenc
- LBV 1806−20Likely binary star in the constellation Sagittarius
- Least-squares spectral analysisPeriodicity computation method
- Leibniz Institute for Astrophysics PotsdamLeibniz Institute for Astrophysics Potsdam (AIP) is a German research institute. It is the
- Leiden ObservatoryEstablished 1633 in the Netherlands
- LempoLempo (Finnish pronunciation: ) is a sort of fiend from Finnish folklore and mythology. Le
- Lenticular galaxyClass of galaxy between an elliptical galaxy and a spiral galaxy
- Leo (astrology)Fifth astrological sign of the zodiac
- Leo (constellation)Zodiac constellation straddling the celestial equator
- Leo ALeo A (also known as Leo III) is an irregular galaxy that is part of the Local Group. It l
- Leo ClusterThe Leo Cluster (Abell 1367) is a galaxy cluster about 330 million light-years distant (z
- Leo GoldbergAmerican astronomer
- Leo I (dwarf galaxy)Leo I is a dwarf spheroidal galaxy in the constellation Leo. At about 820,000 light-years
- Leo MinorConstellation in the northern celestial hemisphere
- Leoncito Astronomical ComplexThe El Leoncito Astronomical Complex (Spanish: Complejo Astronómico El Leoncito - CASLEO)
- LeonidsMeteor shower associated with the comet Tempel–Tuttle
- Lepton epochIn cosmological models of the Big Bang, the lepton epoch was the period in the evolution o
- Lepus (constellation)Constellation in the southern celestial hemisphere
- Letters on SunspotsLetters on Sunspots (Istoria e Dimostrazioni intorno alle Macchie Solari) was a pamphlet w
- Leviathan PateraCaldera on Triton
- Lewis BossAmerican astronomer (1846–1912)
- Libra (astrology)Seventh astrological sign of the zodiac
- Libra (constellation)Zodiac constellation in the southern celestial hemisphere
- LibrationApparent oscillation of a minor body seen from the major body it orbits
- Life on MarsAssessments of possible life on Mars
- Life on TitanScientific assessments on the microbial habitability of Titan
- Life on VenusScientific assessments on the microbial habitability of Venus
- Life-support systemTechnology that allows survival in hostile environments
- Ligeia MareSea on Titan
- Light curveGraph of light intensity of a celestial object or region, as a function of time
- Light scattering by particlesProcess by which dust, particulates, etc. scatter light
- Light-secondUnit of length
- LightHouse for the Blind and Visually ImpairedThe LightHouse for the Blind and Visually Impaired is a San Francisco-based nonprofit orga
- Limb darkeningOptical effect seen in stars
- Limiting magnitudeFaintest item observable by an instrument
- Lincoln Near-Earth Asteroid ResearchAmerican astronomical survey for identifying and tracking near-Earth objects
- Linus (moon)Linus, formal designation (22) Kalliope I Linus, is an asteroid moon that orbits the large
- Lisbon, New HampshireLisbon is a town in Grafton County, New Hampshire, United States. The population was 1,621
- Lissajous orbitQuasi-periodic orbital trajectory
- List of Chinese star namesChinese star names (Chinese: 星名, xīng míng) are named according to ancient Chinese astrono
- List of interstellar and circumstellar moleculesThis is a list of molecules that have been detected in the interstellar medium and circums
- List of the most distant astronomical objectsThis article lists the most distant astronomical objects discovered and verified so far, a
- Lithium burningLithium burning is a nucleosynthetic process in which lithium is depleted in a star. Lithi
- Livarot-Pays-d'AugeLivarot-Pays-d'Auge (French pronunciation: , literally Livarot Land of Auge) is a commune
- Livermore Optical Transient Imaging SystemThe Livermore Optical Transient Imaging System, or LOTIS, is an automated telescope design
- Living Interplanetary Flight ExperimentThe Living Interplanetary Flight Experiment (LIFE or Phobos LIFE) was an interplanetary mi
- Llana of GatholLlana of Gathol is a collection of four science fantasy stories by American writer Edgar R
- Local BubbleMilky Way superbubble
- Local GroupGroup of galaxies that includes the Milky Way
- Local HoleLarge, comparatively empty region of space
- Local Interstellar CloudInterstellar cloud in the Milky Way Galaxy
- Local SheetNearby small galaxy filement
- Local VoidVast void adjacent to the Local Group
- Local VolumeThe Local Volume is a collection of more than 500 galaxies located in an area of the obser
- Location of EarthLocation of Earth in the Universe
- Locational astrologyAstrology that factors in locations on Earth
- Long-exposure photographyLong-exposure, time-exposure, or slow-shutter photography involves using a long-duration s
- Long-period variable starCool luminous pulsating variable star
- Longitude of periapsisIn celestial mechanics, the longitude of the periapsis, also called longitude of the peric
- Longitude of the ascending nodeDefining the orbit of an object in space
- Los Angeles Times Book PrizeSince 1980, the Los Angeles Times has awarded a set of annual book prizes. The Los Angeles
- Lovell TelescopeRadio telescope at Jodrell Bank Observatory, Cheshire, England
- Low Earth orbitOrbit around Earth between 160 and 2000 km
- Low surface brightness galaxyGalaxy which is less bright than the ambient night sky
- Low-ionization nuclear emission-line regionType of galactic nucleus
- Lowell ObservatoryAstronomical observatory and historic landmark in Arizona, US
- Lowell Observatory Near-Earth-Object Search1993–2008 research project
- Loyal Blaine AldrichAmerican astrophysicist and astronomer
- LSR J1835+3259LSR J1835+3259 is a nearby ultracool dwarf of spectral class M8.5, located in constellatio
- Luciano TesiItalian veterinarian and amateur astronomer
- Lucien RudauxLucien Rudaux (French: ; 1874–1947) was a French artist and astronomer, who created famous
- Lucky imagingTechnique for astrophotography
- Lucy (spacecraft)NASA mission to fly by eight asteroids
- LuminosityMeasurement of radiant electromagnetic power emitted by an object
- Luminosity distanceAstronomical measurement in mathematics
- Luminous blue variableType of star that is luminous, blue, and variable in brightness
- Luminous infrared galaxyGalaxy with a high luminosity
- Luna 1Soviet spacecraft
- Luna 10First artificial satellite of the Moon
- Lunar and Planetary LaboratoryThe Lunar and Planetary Laboratory (LPL) is a research center for planetary science locate
- Lunar and Planetary Science ConferenceThe Lunar and Planetary Science Conference (LPSC), jointly sponsored by the Lunar and Plan
- Lunar Crater volcanic fieldLunar Crater volcanic field is a volcanic field in Nye County, Nevada. It lies along the R
- Lunar cratersCraters on Earth's moon
- Lunar dayTime for Moon to complete one rotation on its axis
- Lunar deityDeity that represents the Moon
- Lunar domeType of shield volcano on the Moon
- Lunar eclipseNatural phenomenon wherein the Earth casts a shadow on the Moon
- Lunar geologic timescaleGeological dating system of the Moon
- Lunar landerSpacecraft intended to land on the surface of the Moon
- Lunar magma oceanTheorized historical geological layer on the Moon
- Lunar mareLarge, dark, basaltic plains on Earth's Moon
- Lunar meteoriteMeteorite that originated from the Moon
- Lunar monthTime between successive new moons
- Lunar New YearBeginning of a year in a lunar calendar
- Lunar nodeIntersection of Moon's orbit with Earth's ecliptic
- Lunar north poleThe lunar north pole is the point in the Northern Hemisphere of the Moon where the lunar a
- Lunar observationMethods and instruments used to observe the Moon
- Lunar orbitOrbit of an object around the Moon
- Lunar phaseShape of the Moon's sunlit portion as viewed from Earth
- Lunar Precursor Robotic ProgramProgram of robotic spacecraft missions
- Lunar regolithRock dust covering the Moon
- Lunar resourcesIn situ resources on the Moon
- Lunar Sample Laboratory FacilityThe Lunar Sample Laboratory Facility (LSLF) is a repository and laboratory facility at NAS
- Lunar south poleSouthernmost point on the Moon
- Lunar Surface Electromagnetics ExperimentPlanned radio telescope observatory
- Lunar terraneGeologic province on the Moon
- Lunar theoryTheoretical description of motion of Earth's moon
- Lunar waterPresence of water on the Moon
- Lupus (constellation)Constellation in the southern celestial hemisphere
- Lusigny-sur-BarseLusigny-sur-Barse (French pronunciation: ; lit. 'Lusigny-on-Barse') is a commune in the Au
- LV VulpeculaeLV Vulpeculae, also known as Nova Vulpeculae 1968 no. 1, was the first of two novae in the
- Lyapunov stabilityProperty of a dynamical system where solutions near an equilibrium point remain so
- Lyman-alpha emitterType of distant galaxy
- Lyman-alpha forestAstronomical spectroscopic term
- Lynx (constellation)Constellation in the northern celestial hemisphere
- LyraConstellation in the northern celestial hemisphere
