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- B-type asteroidB-type asteroids are a relatively uncommon type of carbonaceous asteroid, falling into the
- B-type main-sequence starStellar classification distinguished by bright blue luminosity
- B(e) starB-type star with forbidden emission lines
- B2 1420+32Quasar in the constellation of Boötes
- B2FH paper1957 paper on stellar origins of elements
- B612 FoundationPlanetary defense nonprofit organization
- Baade's WindowGap in interstellar dust allowing for observation of the center of the Milky Way Galaxy
- Babcock (crater)Babcock is a lunar impact crater that is located on the far side of the Moon. It was named
- Babylonian astrologyBabylonian astrology was the first known organized system of astrology, arising in the sec
- Babylonian astronomyBabylonian astronomy was the study or recording of celestial objects during the early hist
- Bach quadrangleQuadrangle on Mercury
- Bad Astronomy2002 book by Phil Plait
- Baikonur Cosmodrome Site 31Roscosmos launch site, Kazakhstan
- Baillaud (crater)Baillaud is a lunar impact crater that is located near the north limb of the Moon. The rim
- Baily's beadsThe Baily's beads, diamond ring or more rarely double diamond ring effects, are features o
- Balloon-borne telescopeTelescope carried by a balloon
- BambergTown in Upper Franconia, Bavaria, Germany
- Bamberg (crater)Bamberg is an impact crater in the Mare Acidalium quadrangle of Mars. It is named after th
- Barium starClass of star
- Barnard 68Dark absorption nebula
- Barnard's StarRed dwarf star in the constellation Ophiuchus
- Barred spiral galaxySpiral galaxy with a central bar-shaped structure composed of stars
- Barringer MedalAward
- Barry G. ClarkAmerican astronomer
- BarsoomFictional representation of the planet Mars by Edgar Rice Burroughs
- Bart BokAmerican astronomer and lecturer (1906–1983)
- Barycenter (astronomy)Center of mass of multiple bodies orbiting each other
- Barycentric and geocentric celestial reference systemsCelestial coordinate system
- BaryogenesisHypothesized early universe process
- Baryon acoustic oscillationsFluctuations in the density of the normal matter of the universe
- Bayer (crater)Bayer is a lunar impact crater located in the southwest section of the moon, to the east o
- Bayer designationStar naming system
- BD+17°3248Star in the constellation Hercules
- BD+40°4210BD+40°4210 is a hot luminous giant star located in the constellation Cygnus. It is a membe
- Be starB-type star with emission lines
- BE Ursae MajorisVariable star in the constellation Ursa Major
- Beagle (crater)Beagle is a crater lying within the Margaritifer Sinus quadrangle (MC-19) portion of the p
- Beagle 2Failed Mars lander launched in 2003
- Beagle 3Cancelled Mars lander mission
- Beatrice M. Tinsley PrizeThe Beatrice M. Tinsley Prize is awarded every other year by the American Astronomical Soc
- Becklin–Neugebauer ObjectInfrared emitting object in the constellation Orion
- Beehive ClusterOpen cluster in the constellation Cancer
- Beer (lunar crater)Beer is a relatively small lunar impact crater located on the Mare Imbrium, to the east of
- Beethoven (crater)Beethoven is a crater at latitude 20°S, longitude 124°W on Mercury. It is 630 km in diamet
- Beethoven Burst (GRB 991216)Gamma-ray burst in constellation Orion
- Beethoven quadrangleQuadrangle on Mercury
- Behenian fixed starApplication in medieval astrology
- Belgrade ObservatoryAstronomical observatory in Belgrade, Serbia
- BellatrixStar in the constellation Orion
- Belogradchik ObservatoryAstronomical observatory in Bulgaria
- Belt of VenusAtmospheric phenomenon
- Ben GascoigneNew Zealand–Australian astronomer (1915–2010)
- Benjamin Apthorp GouldAmerican astronomer
- Benjamin BaillaudFrench astronomer (1848–1934)
- Benjamin ZuckermanBenjamin Michael Zuckerman (born August 16, 1943) is an astrophysicist and an emeritus pro
- BeresheetFailed Israeli lunar lander
- Berlin ObservatoryThe Berlin Observatory (Berliner Sternwarte) is a German astronomical institution with a s
- Bernard F. BurkeAmerican astronomer
- Bernard GuinotFrench astronomer
- BetaSecond letter of the Greek alphabet
- Beta AquariiDouble star in the constellation Aquarius
- Beta AraeStar in the constellation Ara
- Beta ArietisBinary star system in the constellation Aries
- Beta AurigaeBinary star system in the northern constellation of Auriga
- Beta BoötisStar in the constellation Boötes
- Beta CamelopardalisBeta Camelopardalis, Latinised from β Camelopardalis, is the brightest star in the norther
- Beta Canis MajorisStar in the constellation Canis Major
- Beta Canis MinorisStar in the constellation Canis Minor
- Beta Canum VenaticorumStar in constellation Canes Venatici
- Beta CapricorniStar system in the constellation Capricornus
- Beta CarinaeStar in the constellation Carina
- Beta CassiopeiaeSecond-brightest star in the constellation Cassiopeia
- Beta CentauriTriple star system in the constellation Centaurus
- Beta CepheiStar in the constellation Cepheus
- Beta Cephei variableType of variable star
- Beta CetiBrightest star in the constellation Cetus
- Beta ColumbaeStar in the constellation Columba
- Beta Comae BerenicesStar in the constellation Coma Berenices
- Beta Coronae AustralisBeta Coronae Australis (Beta CrA), Latinized from β Coronae Australis, is a solitary star
- Beta Coronae BorealisStar in the constellation Corona Borealis
- Beta CorviStar in the constellation of Corvus
- Beta DelphiniBinary star in the constellation of Delphinus
- Beta DoradusVariable star in the constellation Dorado
- Beta DraconisBinary star system in the constellation Draco
- Beta EridaniStar in the constellation of Eridanus
- Beta GruisStar in the constellation of Grus
- Beta HerculisBinary star in the northern constellation of Hercules
- Beta HydriBrightest star of the constellation Hydrus
- Beta LeporisSecond brightest star in the constellation Lepus
- Beta LibraeStar in the constellation Libra
- Beta LupiStar in the constellation of Lupus
- Beta LyraeMultiple star system in the constellation of Lyra
- Beta Lyrae variableType of variable stellar binary
- Beta MonocerotisBeta Monocerotis (Beta Mon, β Monocerotis, β Mon) is a triple star system in the constella
- Beta MuscaeStar in the constellation Musca
- Beta OphiuchiOrange giant star in the constellation Ophiuchus
- Beta PegasiRed giant star in the constellation Pegasus
- Beta PhoenicisBeta Phoenicis (β Phoenicis, β Phe) is a binary star in the constellation Phoenix. Its app
- Beta PictorisSecond brightest star in the southern constellation of Pictor
- Beta Pictoris bSuper Jupiter orbiting Beta Pictoris
- Beta Pictoris cBeta Pictoris c (abbreviated as β Pic c) is the second exoplanet discovered orbiting the y
- Beta Pictoris moving groupMoving group of stars
- Beta PyxidisDouble star in the constellation Pyxis
- Beta ScorpiiMulti-star system in the constellation of Scorpius
- Beta ScutiBeta Scuti, Latinized from β Scuti, is a binary star system in the southern constellation
- Beta TauriStar in the constellation Taurus
- Beta TauridsMeteor shower
- Beta Trianguli AustralisStar in the constellation Triangulum Australe
- Beta VirginisStar in the constellation Virgo
- BetelgeuseRed supergiant star in the constellation Orion
- Betty-Jean MaycockBetty Jean Maycock Harrington (born December 13, 1942) is a former Olympic gymnast from Cl
- BG Canis MinorisVariable star in the constellation of Canis Minor
- BH VirginisEclipsing binary star in the constellation Virgo
- Bi-elliptic transferType of orbital maneuver
- Bicycle pumpA bicycle pump is a type of positive-displacement air pump specifically designed for infla
- Biela's CometLost comet
- Big BangPhysical theory of the cosmos
- Big Bang nucleosynthesisProcess during the early universe
- Big CrunchHypothetical scenario for the ultimate fate of the universe
- Big DipperPattern of seven bright stars in the constellation Ursa Major
- Big MuleyLargest lunar rock collected during the Apollo program
- Big RingRing-shaped large-scale structure near the constellation Boötes
- Big RipCosmological model
- Binary asteroidSystem of two asteroids orbiting their common center of mass
- Binary mass functionAstronomic function
- Binary pulsarTwo pulsars orbiting each other
- Binary starSystem of two stars orbiting each other
- Binary systemTwo astronomical bodies which orbit each other
- BiosignatureSubstance providing scientific evidence of past or present life
- Bipolar nebulaType of nebula that has two lobes extending from a central star
- Bipolar outflowTwo continuous flows of gas from the poles of a star
- Bisei Spaceguard CenterJapanese astronomical observatory
- BL BoötisStar in the constellation Boötes
- BL HerculisVariable star in the constellation Hercules
- BL Herculis variableType of variable star
- BL LacertaeActive galaxy in the constellation Lacerta
- BL Lacertae objectType of active galactic nucleus
- Black dwarfTheoretical stellar remnant
- Black Eye GalaxySpiral galaxy in the constellation Coma Berenices
- Black holeCompact astronomical body
- Black Widow pulsarMillisecond pulsar in the constellation Sagitta
- Blagg (crater)Blagg is a tiny lunar impact crater located on the Sinus Medii. It is a circular crater wi
- BlazarVery compact quasi-stellar radio source
- Blink comparatorAstronomy viewing apparatus
- BlitzarHypothetical type of neutron star
- Blue giantHot, giant star of early spectral type
- Blue hourPeriod of twilight in the morning or evening
- Blue loopIn the field of stellar evolution, a blue loop is a stage in the life of an evolved star w
- Blue moonAstronomical phenomenon
- Blue stragglerMain sequence star that is more luminous and bluer than expected
- Blue supergiantHot, luminous star with a spectral type of A9 or earlier
- Blueberry galaxyType of starburst galaxy
- Bob TwiggsRobert J. Twiggs (born November 27, 1935) is an American professor of Astronautics and Spa
- Bok globuleIsolated, small, and opaque nebula
- Bok TelescopeThe Bok Telescope (also known as the 90-inch) is the largest telescope operated solely by
- BOLAS (spacecraft)Moon-orbit spacecraft concept
- BolideExtremely bright meteor
- Bolometric correctionCalculation in astronomy
- Bond albedoFraction of incident light reflected by an astronomical body
- BOOMERanG experimentHigh-altitude balloon package measuring the universe's geometry
- BoötesConstellation in the northern celestial hemisphere
- Boötes IThe Boötes Dwarf Galaxy (Boo I dSph) is a galaxy discovered in 2006, which appears faint,
- Boötes IIDwarf spheroidal galaxy in the constellation Boötes
- Boötes VoidRegion of space
- Bopolu (crater)Bopolu is an impact crater located within the Meridiani Planum extraterrestrial plain of M
- Borealis BasinLarge basin in the northern hemisphere of Mars
- Borealis quadrangleQuadrangle on Mercury
- Borough of SloughThe Borough of Slough is a unitary authority with borough status in the ceremonial county
- Bortle scaleScale for measuring the brightness of the night sky
- BOSS Great WallOne of the largest superstructures in the observable universe
- Boyden ObservatoryBoyden Observatory is an astronomical research observatory and science education centre lo
- BPM 37093White dwarf star in the constellation Centaurus
- Brane cosmologyTheories in particle physics and cosmology
- Brian G. MarsdenBrian Geoffrey Marsden (5 August 1937 – 18 November 2010) was a British astronomer and the
- Bright spots on CeresSurface features discovered 2015
- Bright Star CatalogueYale Catalogue of Bright Stars
- Brightest cluster galaxyBrightest galaxy within a galaxy cluster
- Brightness temperatureMeasure of electromagnetic energy
- Brisbane Water National ParkBrisbane Water National Park is a national park on the Central Coast of New South Wales, A
- British Astronomical AssociationAssociation of amateur astronomers
- British National Space CentreThe British National Space Centre (BNSC) was an agency of the Government of the United Kin
- Brocchi's ClusterAsterism of 10 stars in the constellation Vulpecula
- Brown dwarfSubstellar object
- Bruce HapkeAmerican planetary scientist (born 1931)
- Bruce MedalAward for contribution to astronomy
- Bruce T. DraineAmerican astrophysicist
- Bruno Rossi PrizePrize awarded annually by the American Astronomical Society
- Brussels PlanetariumPlanetarium in Brussels, Belgium
- BT MonocerotisNova seen in 1939
- BTA-6Optical telescope at the Special Astrophysical Observatory in southern Russia
- Bubble NebulaEmission nebula in the constellation Cassiopeia
- Bubble Nebula (NGC 6822)The Bubble Nebula in Barnard's Galaxy has the official designation of Hubble 1925 I as it
- Bullet ClusterTwo colliding clusters of galaxies in constellation Carina
- Bullet GroupMerging galaxy group
- Butterfly ClusterOpen cluster in Scorpius
- BY DraconisStar in the constellation Draco
- BY Draconis variableVariable stars of late spectral types
