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- W Ursae MajorisW Ursae Majoris (W UMa) is the variable star designation for a binary star system in the n
- W Ursae Majoris variableA W Ursae Majoris variable, also known as a low mass contact binary, is a type of eclipsin
- W Virginis variableW Virginis variables are a subclass of Type II Cepheids which exhibit pulsation periods be
- W. David ArnettAmerican astrophysicist
- Wallace John EckertAmerican astronomer (1902–1971)
- Wallops Flight Facility Launch Area 3Launch Area 3 (LA-3) at the Wallops Flight Facility is a launch complex which was used, mo
- Walter Sydney AdamsAmerican astronomer (1876–1956)
- Wardaman peopleThe Wardaman people are a small group of Aboriginal Australians living about 145 kilometre
- Warm dark matterWarm dark matter (WDM) is a hypothesized form of dark matter that has properties intermedi
- Warm–hot intergalactic mediumPlasma that cosmologists believe exists between galaxies
- Warren De la RueBritish astronomer, chemist and photographer
- Warrick CouchAustralian astronomer (born 1954)
- WarrumbunglesThe Warrumbungles is a mountain range in the Orana region of New South Wales, Australia. T
- WASP-13WASP-13, also named Gloas, is a star in the Lynx constellation. The star is similar, in te
- WASP-33bWASP-33b is an extrasolar planet orbiting the star HD 15082. It was the first planet disco
- WASP-66WASP-66, also known as TYC 7193-1804-1, is an F-type star in the constellation Antlia. It
- WASP-95WASP-95 is a star 451 light-years (138 parsecs) away in the constellation Grus. With an ap
- Water distribution on EarthMost water in Earth's atmosphere and crust comes from saline seawater, while fresh water a
- Weak gravitational lensingGravitational deflection of light
- Webb's First Deep FieldFirst operational image from NASA's James Webb Space Telescope
- Westbrook NebulaWestbrook Nebula (CRL 618) is a bipolar protoplanetary nebula which is located in the cons
- Westerhout 40Star-forming region in the constellation Serpens
- Westerlund 1Westerlund 1 (abbreviated Wd1, sometimes called Ara Cluster) is a compact young super star
- Western astrologySystem of astrology used in the Western world
- Whirlpool GalaxyGalaxy in the constellation Canes Venatici
- White dwarfStellar core remnant
- White Sands Missile RangeMilitary testing area in New Mexico, US
- Wide Field and Planetary CameraThe Wide Field/Planetary Camera (WFPC) (pronounced as wiffpick (Operators of the WFPC1 wer
- Wide Field and Planetary Camera 2The Wide Field and Planetary Camera 2 (WFPC2) is a camera formerly installed on the Hubble
- Wide Field Camera 3Astronomical camera on the Hubble Space Telescope
- Wild Duck ClusterThe Wild Duck Cluster (also known as Messier 11, or NGC 6705) is an open cluster of stars
- Wilhelm BeerPrussian astronomer and banker
- Wilhelm GlieseGerman astronomer
- Willem Hendrik van den BosDutch-South African astronomer
- Willem Jacob LuytenWillem Jacob Luyten (March 7, 1899 – November 21, 1994) was a Dutch-American astronomer.
- William Cranch BondAmerican astronomer (1789–1859)
- William Herschel TelescopeTelescope in La Palma, Spain
- William Lewis ElkinAmerican astronomer (1855–1933)
- William P. BidelmanAmerican astronomer
- William Parsons, 3rd Earl of RosseEnglish engineer and astronomer (1800–1867)
- William Wallace CampbellAmerican astronomer
- Winter solsticeAstronomical phenomenon
- WISE 0855−0714Brown dwarf in the constellation Hydra
- WISE 1639−6847WISE J163940.83−684738.6 (designation is abbreviated to WISE 1639−6847, or W1639) is a bro
- Wolf–Rayet starHeterogeneous class of stars with unusual spectra
- WorldTotality of existing entities
- World Space AwardThe World Space Award (also known as IAF World Space Award) is presented by International
- WormholeHypothetical topological feature of spacetime
- WR 147WR 147 is a multiple star system in the constellation of Cygnus. The system is extremely r
