#celestial_body__celestialbody__heavenly_body natural objects visible in the sky
supertype: natural_object__naturalobject an object occurring naturally; not made by man
part of: existence
subtype: planet any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system
subtype: asteroid__minor_planet__minorplanet__planetoid any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)
subtype: Pallas a large asteroid; the second asteroid to be discovered
instance: Apollo_asteroid Ceres Vesta
subtype: evening_star__eveningstar__Hesperus__Vesper a planet (usually Venus) seen at sunset in the western sky
subtype: morning_star__morningstar__daystar__phosphoru a planet (usually Venus) seen just before sunrise in the eastern sky
subtype: superior_planet any of the planets whose orbit lies outside the earth's orbit
subtype: Jovian_planet__gas_giant__gasgiant any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)
instance: Jupiter Neptune.Jovian_planet__neptune Saturn Uranus
instance: Red_Planet__Mars Pluto
subtype: terrestrial_planet__terrestrialplanet a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar system
subtype: inferior_planet any of the planets whose orbit lies inside the earth's orbit
instance: Mercury Venus
instance: Earth.terrestrial_planet__earth__globe Red_Planet__Mars
subtype: planetesimal one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system
subtype: quasar__quasi-stellar_radio_source__quasistellarradiosource a starlike object that may send out radio waves and other forms of energy; large red shifts imply enormous recession velocities
subtype: satellite any celestial body orbiting around a planet or star
subtype: Deimos the smaller of the two satellites of Mars
subtype: Galilean_satellite__Galilean one of the four satellites of Jupiter that were discovered by Galileo
instance: Callisto Europa Ganymede Io
subtype: moon.satellite any natural satellite of a planet; "Jupiter has sixteen moons"
subtype: moon the natural satellite of the Earth; "the average distance to the moon is 384,400 kilometers"; "men first stepped on the moon in 1969"
subtype: Phobos the larger of the two satellites of Mars
instance: Titan.satellite__titan
subtype: star (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
subtype: binary_star__binary__double_star a system of two stars that revolve around each other under their mutual gravitation
subtype: Altair double star 15.7 light years from Earth; the brightest star in the Aquila constellation
subtype: Sirius__Dog_Star__Canicula__Sothis the brightest star in the sky; in Canis Major
instance: Aldebaran Algol Alpha_Centauri__Rigil_Kent__Rigil Antares Epsilon_Aurigae Procyon Rigel__Beta_Orionis Vega
subtype: Deneb the brightest star in Cygnus
subtype: Denebola a star in Leo approximately 43 light years from Earth
subtype: fixed_star__fixedstar any star in the Ptolemaic theory of planetary motion
subtype: giant_star__giantstar__giant a very bright star of large diameter and low density (relative to the Sun)
instance: Arcturus Capella
subtype: loadstar__lodestar guiding star; a star that is used as a reference point in navigation of astronomy
instance: Polaris__North_Star__polar_star__polarstar__polestar
subtype: multiple_star a system of three or more stars associated by gravity
instance: Castor__Alpha_Geminorum the_Trapezium__Trapezium
subtype: neutron_star__neutronstar a star that has collapsed under its own gravity; it is composed of neutrons
subtype: pulsar a degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation
subtype: nova a star that ejects some of its material in the form of a cloud and become more luminous in the process
subtype: red_dwarf_star__reddwarfstar__red_dwarf__reddwarf a small cool star; approximately 100 times the mass of Jupiter
subtype: flare_star__flarestar a red dwarf star in which luminosity can change several magnitudes in a few minutes
instance: Proxima_Centauri__Proxima
subtype: red_giant_star__redgiantstar__red_giant__redgiant a large cool star; has a relatively low surface temperature and a diameter large relative to the sun
subtype: sun a typical star that is the source of light and heat for the planets in the solar system; "the sun contains 99.85% of the mass in the solar system"
subtype: sun.star any star around which a planetary system evolves
subtype: supergiant an extremely bright star of very large diameter and low density
subtype: Canopus supergiant star 650 light years from Earth; second brightest star in the sky
instance: Betelgeuse__Alpha_Orionis
subtype: supernova a star that explodes and becomes extremely luminous in the process
instance: Crab_Nebula
subtype: variable_star__variable a star that varies noticeably in brightness
instance: Polaris__North_Star__polar_star__polarstar__polestar
subtype: white_dwarf_star__whitedwarfstar__white_dwarf__whitedwarf a faint star of enormous density
instance: Alpha_Crucis Beta_Centauri Beta_Crucis Pollux Regulus Spica Sterope__Asterope
subtype: star.celestial_body any celestial body visible (as a point of light) from the Earth at night
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