n
(astronomy) An astronomical body (such as a star) that accretes surrounding material
n
the farthest place in the galaxy
n
(astronomy) Apoapsis around Mercury.
n
(astronomy) Apoapsis around a black hole.
n
(astronomy) An asteroid that formerly had a high risk of collision with Earth.
n
(astronomy) A naturally occurring solid object, which is smaller than a planet, larger than a meteoroid and not a comet, that orbits a star and often has an irregular shape.
n
(astronomy) A method of stellar classification in which stars are assigned Greek letters (α, β, γ, etc.) in decreasing order of brightness.
n
(astronomy) One of certain girdles or zones on the surface of the planets Jupiter and Saturn, supposed to be of the nature of clouds.
n
(astronomy) Synonym of binary star.
n
(astronomy) A binary star.
n
(astronomy) Two gravitationally connected stars or other celestial objects which orbit around their center of mass.
n
(astronomy) A planet that orbits a black hole.
n
Any extraterrestrial body that collides with Earth.
n
(historical) A device invented by Galileo Galilei to observe Jupiter's moons with the purpose of finding longitude on Earth. It took the form of a piece of headgear with a telescope taking the place of an eyehole.
n
(astronomy, astrology) A natural object which is located outside of Earth's atmosphere, such as a comet, an asteroid, the Moon, a planet, the Sun, or a star.
n
(astronomy, astrology) Synonym of celestial body.
adj
(astronomy) Having an orbit around both stars in a binary star system, or relating to such an orbit.
adj
(astronomy) Surrounding a planet
adj
(astronomy) That surrounds the secondary star of a binary star system
n
The part of space about 35,786 km (22,236 mi) above sea level, in the plane of the Equator, where near-geostationary orbits may be implemented.
n
(historical) The outermost part of the cosmos in the Ptolemaic system; Heaven.
n
(figuratively) A wide, seemingly unlimited assortment.
n
(astronomy) A binary star whose component stars are in physical contact (share an upper atmosphere).
n
(astronomy) Two stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields; a binary star.
n
(astronomy) a binary star
n
(astronomy) A star of relatively small size.
adj
(astronomy) Of a star or class of stars, hotter than the sun.
n
(astronomy, planetology) An extrasolar comet; A comet which exists outside Earth's solar system, including interstellar comets and comets that orbit stars other than the sun.
n
(astronomy) a ring or ring system around an exoplanet (extrasolar planet)
n
(astronomy) A system of exoplanets and associated star.
n
(astronomy) The amount by which a star in a binary system extends beyond its Roche lobe.
n
(uncountable, astronomy, historical) In the geocentric Ptolemaic system, the eighth celestial sphere which carried the fixed stars; (countable, by extension) any celestial sphere.
n
(space science) A scatter plot on which the periapses and apoapses of the pieces of space debris from a single fragmentation event are plotted with respect to the pieces' orbital periods.
n
(astronomy) A red dwarf star about 20 light years from the Solar System. Gliese 581 is notable due to at least two exoplanets that might be life-sustaining.
n
(astronomy) The zone around a star where a planet could experience temperatures like those on Earth, allowing for the possible existence of liquid water and of life.
n
(astronomy) A conjunction where several planets or stars are found together.
n
A natural celestial object, visible in the sky, such as a star, planet, natural satellite, asteroid, comet, the Moon or the Sun. Objects flying or moving in the atmosphere are not usually considered as heavenly bodies.
n
M31-V1: A star, a cepheid variable in Andromeda Galaxy, Local Group, Local Supercluster, Laniakea, located in the Andromeda constellation; the first variable star discovered outside the Milky Way Galaxy, and first star identified whose distance was unequivocably beyond the confines of the Milky Way.
n
(astronomy, countable) Initialism of habitable zone. [(astronomy) The zone around a star where a planet could experience temperatures like those on Earth, allowing for the possible existence of liquid water and of life.]
n
(astronomy) An icy planetoid: an astronomical object, such as Pluto, Sedna or (for some authors) Ceres that is large enough to be a world and contains more ice than a typical asteroid.
n
A planet that orbits the Sun within the orbit of the Earth, and thus does not show retrograde motion when viewed from Earth
n
(astronomy) A doughnut-shaped region of the Oort cloud located 2,000 to 20,000 AU from the sun. It is home to many minor planets, notably sednoids.
n
The area of the Solar System that comprises certain objects that are relatively close to the Sun, including Mercury, Venus, Earth and Mars, while not including the other planets.
n
(archaic, rare) The placing of something among the stars.
adj
(astronomy) Between the components of a binary star.
adj
(astronomy) Between clouds of stars.
n
(astronomy) That part of outer space between the planets of a solar system and its star
adj
(astronomy) Within a binary star system
adj
(astronomy) Between the planet Mercury and the sun.
n
(astronomy) The 1:2 resonance, beyond which few objects are known; it may be the outer edge of the classical Kuiper belt or just the beginning of a broad gap.
n
(astrophysics) second Lagrange point, located further out from the primary of a system where a smaller object orbits a larger one, behind the smaller object, inline with a line drawn through the centres of the larger and smaller objects
n
An interstellar cloud in Orion Spur, Perseus Arm, Milky Way Galaxy, where the Solar System is currently located, and is passing through.
n
(astronomy) A period similar to the Maunder Minimum observed on a star other than the Sun.
n
(astronomy, celestial mechanics) An imaginary celestial body (corresponding to another, real, orbiting one) which orbits with constant speed along an auxiliary circle (a circle which shares a diameter with the major axis of the elliptical orbit of the corresponding real celestial body), such that its position coincides with the position of the corresponding, real celestial body when that body passes through periapsis.
n
(astronomy) A stellar system that has multiple stars orbiting around each other; multiple star
n
(astronomy) A hypothetical star postulated to be orbiting the Sun to explain a perceived cycle of mass extinctions in the geological record.
n
(astronomy) A scenario for the dynamical evolution of the Solar System, proposing the migration of the giant planets from an initial compact configuration into their present positions, long after the dissipation of the initial protoplanetary gas disk.
v
To place an object (e.g. a satellite) into an orbit around a planet.
n
(astronomy) a star that is not part of any galaxy, but exists in intergalactic space instead
n
(planetology) The hot liquid material found near the centre of some planets, distinct from the solid inner core.
adj
(astronomy) Describing a pair of binary stars having a common convective envelope
n
(astronomy) Any substantial body associated with the development of planets: a protoplanet, planetesimal.
n
(astronomy) The star nearest a celestial pole of a planet.
n
Short for Population III. [(astrophysics, usually attributively) A hypothetical population or group of stars which may have existed in the early history of the Universe, characterized by being extremely massive and hot and having an extremely low metallicity.]
n
The most massive component of a gravitationally bound system, such as a planet in relation to its satellites.
n
(astronomy) Synonym of protoplanetary disc
adj
(astronomy) Describing a system that is evolving into a binary star.
n
(astronomy) Alternative form of protoplanetary disk [(astronomy) A rotating disk of dense gas and dust surrounding a young newly formed star, and from which planets may be formed.]
n
(astronomy) A rotating disk of dense gas and dust surrounding a young newly formed star, and from which planets may be formed.
n
A very small protoplanet
adj
(astronomy) Of or pertaining to a protostar.
n
Any of the meteors in a January meteor shower whose radiant is inside the constellation Boötes.
n
(astronomy) The teardrop-shaped region around a star in a binary system within which orbiting material is gravitationally bound to that star.
n
(planetology) a planet that flies through interstellar space and has no star to encircle
n
(astronomy) A trans-Neptunian region of the Solar System that overlaps the outer edge of the Kuiper belt, but also extends far beyond it, and is populated sparsely by small Solar System bodies.
n
(astronomy) A satellite.
n
The Sun and all the heavenly bodies that orbit around it, including the eight planets, their moons, the asteroids, and comets.
n
(astronomy) Stars not included in any constellation.
n
(computing theory) A measure of the structural complexity of a regular expression, equal to the maximum nesting depth of stars in the expression.
n
A gelatinous substance that, according to folklore, is deposited on the earth during meteor showers.
adj
(by extension) Exceptional.
n
(astronomy) An area on the surface of the earth, usually having an elongated oval shape, containing rocky fragments which detached from a disintegrating meteor as it streaked through the portion of earth's atmosphere above the area.
n
A young, very massive, and very dense star cluster.
n
(astronomy) A double star system, in which a cool star is within the nebula of a hot star
n
A satellite orbit where the orbital period is equal to, or multiples of, the Earth’s rotational period; i.e. making one, two, three, etc., orbits in a 24-hour period. Examples include geosynchronous (period equals Earth's rotation), semisynchronous (two orbits per day); and geostationary (geosynchronous orbit where satellite maintains a fixed position on the equator).
n
(astronomy) A planetary system; a set of planets orbiting a star or star system
n
(astrology) An aspect in astrology, a calculated node in a reading, that is not a real planet.
n
The hypothesis that the bodies in some orbital systems, including the Sun's, orbit at semimajor axes in a function of planetary sequence.
n
(astronomy) a trinary star
n
(astronomy) A unit of zodiacal dust, equal to the amount of interplanetary dust in the inner solar system, which absorbs light and re-radiates it with a luminosity about 10⁻⁷ that of the sun.
n
(astronomy) A cloud of dust, lying in the plane of the ecliptic, that gives rise to the zodiacal light.
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