n
Any stony meteorite that contains no chondrules
n
(astronomy) An asteroid possessing an orbit that crosses the orbit of the Earth and an orbital period of over one year, with semimajor axes greater than 1 AU, and perihelion distances less than 1.017 AU.
n
(astronomy) A collection of small bodies (such as asteroids) which orbit a star.
n
(astronomy) A theoretical type of terrestrial planet that could form, if protoplanetary discs are carbon-rich and oxygen-poor.
n
(astronomy) A planetoid and cubewano orbiting in the Kuiper belt.
n
(astronomy) A hypothetical type of planet resulting from the atmosphere and outer layers of a gas giant being stripped away, leaving the rocky, metallic core.
n
(astronomy) Synonym of carbon planet
n
a pair of planemos in orbit around each other, where the barycenter of their orbits lies outside of both planemos, which in turn is in orbit about a star.
n
(astronomy) A world-like planetoid of the Solar system, that is smaller than the classical planets. More specifically, any astronomical body which has a geology defined by hydrostatic equilibrium (and thus has taken the shape a body of water would take, as opposed to a small Solar System body), orbits the Sun (as opposed to a moon), and does not gravitationally dominate other bodies near its orbit (as opposed to a classical planet or, in IAU usage, as opposed to a planet).
n
(planetology) A planet whose characteristics are similar to Jupiter, but which orbits its parent star much more closely and thus has higher temperatures.
n
(astronomy) A planetary nebula in Gemini, Milky Way Galaxy
adj
(astronomy) Pertaining to Europa, a minor planet in the Main Asteroid Belt, or any (theoretical/fictional) inhabitants of the minor planet Europa.
n
Alternative form of exoplanet [(astronomy, planetology) A planet which exists outside Earth's solar system.]
n
(astronomy, planetology) A planet which exists outside Earth's solar system.
n
Alternative form of exoplanet [(astronomy, planetology) A planet which exists outside Earth's solar system.]
adj
(astronomy) Describing a trojan satellite of an exoplanet
n
An extrasolar planetary system (“solar system”), a star system with exoplanets beyond our Solar System.
n
(astronomy, planets) A planet larger than terrestrial planets, composed mostly of gases and astronomical ices.
n
(astronomy) A planet which orbits in the habitable zone around a star, where temperatures like those on Earth occur, allowing for the possible existence of liquid water and of life.
n
(planetology) An exosolar planet whose characteristics are similar to Jupiter, but which orbits its parent star much more closely and thus has higher temperatures.
n
(planetology) An exosolar planet whose characteristics are similar to the ice giants Uranus and Neptune, but which orbits its parent star much more closely and thus has higher temperatures.
n
(planets) A planet in OGLE-2005-BLG-390L star system, Milky Way Galaxy, Scorpius contellation
n
(astronomy) A giant planet composed mostly of astronomical ices (condensed forms of volatile compounds) including water, methane, oxygen, carbon, nitrogen, and sulfur, and smaller than a gas giant. (e.g. Neptune and Uranus)
n
(astronomy, planetology) A comet (or exocomet) located in interstellar space, and not gravitationally bound to a star.
n
(astronomy, planetology) a planetary-mass object which has either been ejected from its system or was never gravitationally bound to any star or other such object, and that therefore orbits the galaxy directly.
n
Any of the four gas giant planets in the Solar System: Jupiter, Uranus, Saturn, or Neptune.
n
(astronomy, informal) The star Fomalhaut.
n
(astronomy) Any of the 8 celestial bodies which orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune (a celestial body that fits the 2006 IAU definition of planet).
n
(astronomy) The planet in the solar system with the closest orbit to the Sun, named after the god; represented by ☿.
n
(astronomy) a planet that is between the size of Mercury and Ceres
n
(astronomy) A relatively small (sand- to boulder-sized) fragment of debris in a star system that produces a meteor when it hits the atmosphere
n
(science fiction) An astronomical body smaller than a planetoid, such as an asteroid or planetesimal.
n
(astronomy) An astronomical object in direct orbit around the Sun that is not a planet or a comet.
n
(astronomy) a very small body orbiting a planet, often as part of a planetary ring system.
n
(astronomy, with definite article) The planet Venus as observed in the eastern sky around dawn.
n
(astronomy) A small Solar System body (ie. asteroid, comet, or large meteoroid) whose orbit brings it into proximity with Earth's orbit.
n
(astronomy, countable) Initialism of near-Earth object. [(astronomy) A small Solar System body (ie. asteroid, comet, or large meteoroid) whose orbit brings it into proximity with Earth's orbit.]
n
(astronomy) The eighth planet in our solar system, represented in astronomy and astrology by ♆.
n
(in the works of Zecharia Sitchin) A supposed planet in a highly elliptic orbit around the Sun.
n
(astronomy) Any planet of the Solar System whose orbit is located beyond the asteroid belt, i.e., any of Jupiter, Saturn, Uranus, or Neptune.
n
(planetology) An exosolar planet whose characteristics are similar to Jupiter, but which orbits its parent star much more closely and thus has higher temperatures.
n
(astronomy) In an orbit around the planet Mercury, the point that is closest to Mercury.
n
(rare) Alternative form of perikrone [Periapsis around the planet Saturn.]
n
(astronomy) an astronomical object with enough mass to achieve hydrostatic equilibrium, but not enough to initiate core fusion at any time in its existence. That is, it is rounded in shape and is smaller than a star. Planemos include planets, dwarf planets, and the larger moons of the Solar System (satellite planets), but also sub-brown dwarfs and rogue planets between the stars.
n
(astronomy) A body which is massive enough to be in hydrostatic equilibrium (generally resulting in being an ellipsoid) but not enough to attain nuclear fusion and, in IAU usage, which directly orbits a star (or star cluster) and dominates the region of its orbit; specifically, in the case of the Solar system, the eight major bodies of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
n
(astronomy) A theoretical ninth planet in the Solar system, the gravitational effects of which would explain the improbable orbital configuration of a group of trans-Neptunian objects that orbit mostly beyond the Kuiper belt.
n
Alternative form of Planet 9 [(astronomy) A theoretical ninth planet in the Solar system, the gravitational effects of which would explain the improbable orbital configuration of a group of trans-Neptunian objects that orbit mostly beyond the Kuiper belt.]
n
(astronomy) A hypothetical planet in the Solar system, beyond the currently known outermost planet. (The term was applied to Eris for a short while, when Pluto was still considered the ninth planet.)
n
(astronomy) Any secondary body in the Solar system that is geologically differentiated or in hydrostatic equilibrium and thus has a planet-like geology: a planet, dwarf planet, or the larger moons and asteroids.
n
(astronomy) a ring of dust, moonlets and other matter that orbits a planet (such as Saturn) as a flat disc; gaps in the ring are due to the presence of shepherd moons
n
(uncommon) Those things that are planets; the state of being a planet.
n
(astronomy) Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.
n
(astronomy) A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
n
(astronomy) A theoretical planetary body that formed as a moon orbiting a planet, but which has become tidally detached, so that it enters orbit about its star, separated from its parent planet.
n
(astronomy, obsolete) A trans-Neptunian dwarf planet.
n
(planets) A planet in Lich star system, Milky Way Galaxy, Virgo constellation; One of the pair of planets that were the first exoplanets which were discovered. A planet in orbit of the pulsar Lich (PSR B1257+12)
n
(astronomy) A near-Earth asteroid or comet with an orbit such that it has the potential to make close approaches to the Earth and is of a size large enough to cause significant regional damage in the event of impact.
n
(astronomy) A conglomeration of material that will form a planetesimal
n
(astronomy, obsolete, archaic) A planet; a natural satellite of a sun.
n
An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets
n
(astronomy) A habitable planet that has a surface temperature of −50 to 0°C (colder than is optimal for most terrestrial life), such as Mars.
n
(astronomy) a body comparable to a planet, but not a planet, such as a dwarf planet or a planetary-mass moon
n
(astronomy) An object in a specific type of coorbital configuration (1:1 orbital resonance) with a planet, causing it to stay close to the planet over many orbital periods, despite not being a true satellite.
n
Alternative form of quasi-satellite. [(astronomy) An object in a specific type of coorbital configuration (1:1 orbital resonance) with a planet, causing it to stay close to the planet over many orbital periods, despite not being a true satellite.]
n
(planetology, informal) A hot Jupiter.
n
(astronomy) A planet composed primarily of metals and/or silicate rocks and having a solid surface.
n
A moon or other smaller body orbiting a larger one.
n
(astronomy) A planet viewed as a satellite of another object, such as another star; an exoplanet.
n
(astronomy) Any trans-Neptunian object whose orbit is wholly within the scattered disc.
n
Vallis Schrödinger; Ellipsis of Schrödinger Valley.; A valley in LQ30, Moon, Earth-Moon System, Solar System
n
(astronomy) A trans-Neptunian object of the inner Oort cloud, that is, one with a perihelion greater than 75 AU.
adj
(astronomy) Having an orbital period of less than 200 years, especially said of comets
n
(astronomy) a planet that shares similar physical characteristics, such as size, density and mass, with another planet
n
(astronomy) A body in the Solar System other than a planet, dwarf planet or natural satellite.
n
Alternative letter-case form of Solar System [The Sun and all the heavenly bodies that orbit around it, including the eight planets, their moons, the asteroids, and comets.]
n
All the objects in orbit around the Earth that were created by human activity, but now have no useful purpose.
adj
(astronomy) Describing bodies smaller than a planet
n
(astronomy) A sungrazing comet
adj
(astronomy) More massive than the planet Jupiter; relating to a super-Jupiter
n
(astronomy) Any astronomical object (especially an exoplanet) that is more massive than Jupiter
n
A planet that orbits the Sun beyond the orbit of the Earth and thus shows retrograde motion when viewed from the Earth
n
(archaic, astronomy) A planet of the third-degree/third-order. The planet of a planet (secondary planet) of a planet (primary planet). An object (moonmoon) which orbits an object (moon) which orbits an object (planet) which orbits a star.
n
(astronomy) Any natural object (usually a minor planet (asteroid) or a hypothetical planet) in the Solar System with all or most of its orbit outside the orbit of planet Neptune.
n
Alternative form of trans-Neptunian object. [(astronomy) Any natural object (usually a minor planet (asteroid) or a hypothetical planet) in the Solar System with all or most of its orbit outside the orbit of planet Neptune.]
n
(astrophysics) An object residing at a Trojan point.
n
(astrophysics) a planet that occupies a Trojan point of a star system
n
(humorous) Uranus (a gas giant, the 7th planet of the Solar System)
n
(astronomy) The second planet in our solar system, named for the goddess; represented in astronomy and astrology by ♀.
n
(astronomy, historical) A hypothetical planet proposed in the 19th century to exist in an orbit between Mercury and the Sun.
n
(astronomy) A member of the hypothetical population of small asteroids orbiting in the dynamically stable zone between 0.08 and 0.21 AU from the Sun
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