n
(historical) A hypothetical twin planet to earth, proposed by the Pythagoreans, which cannot be seen from earth.
adj
A geostationary orbit around Mars.
n
(science fiction) An inhabitant of an asteroid belt, especially that between Mars and Jupiter.
adj
Surrounding or moving around the Sun
adj
(astronomy) Relating to an astronomical body found within the orbit of Neptune.
adj
Situated below the orbit of the Moon, or equivalent distance from the Earth.
n
The hypothetical joint formation of Earth and its Moon from the same primordial cloud of material.
n
A hypothetical planet sharing an orbit with the earth, but on the opposite side of the sun.
n
(astronomy, by extension) The outermost layer of any terrestrial planet.
n
Alternative form of deep space [All of space beyond the gravitational influence of Earth, or outside the Solar System, or distant from stars]
n
Alternative form of deep space [All of space beyond the gravitational influence of Earth, or outside the Solar System, or distant from stars]
adv
(science fiction) On the surface of a planet or moon (i.e. not in space)
n
Any planet similar to the Earth (our earth): an exoplanet viewed as another earth, or a potential one.
n
(astronomy) A unit of mass equal to that of the Earth, used to express the mass of other planets etc. 1 M_🜨 = 6 × 10²⁴ kg.
adj
(astronomy) Approaching the Earth closely.
adj
Heading towards Earth.
n
(science fiction) A spaceport on the planet Earth.
n
The time of "day" when the Earth begins to sink below the horizon of another planet according to a local observer.
n
Alternative form of exoearth [Any earthlike exoplanet]
n
An ocean on a planet other than Earth.
adj
Pertaining to, or occurring in the nearby region of space outside the Earth's atmosphere
adj
Pertaining to a terrestrial planet with a living biosphere, other than Earth.
n
Any activity done by an astronaut outside of a spacecraft etc; a spacewalk or moonwalk.
n
(poetic, slang) Synonym of outer space
n
(humorous) A notional space monster invoked to explain the high failure rate of probes sent to Mars.
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
The extreme north of the Earth; an area in a northerly region.
adj
Pertaining to the extreme north of the earth, or (usually jocular) to a specific northern country or area.
adj
(astronomy) Nearer to the Sun than the Earth is.
n
(science fiction) An inhabitant of the inner planets of the Solar System
adj
(archaic) interstellar
adj
Synonym of interplanetary
adj
Existing or occurring between planets.
n
The space between the stars.
n
(chiefly science fiction) An inhabitant of the planet Jupiter; a Jovian.
n
(rare) An astronaut who travels to the Moon; a lunarnaut.
n
(astrology) A person under the astrological influence of the planet Mars.
adj
(not comparable, Roman mythology) Pertaining to Mercury, the Roman god of, among other things, commerce, financial gain, communication, and thieves and trickery; hence (comparable), money-making; crafty.
adj
of or relating to Mercury (the planet)
n
(Earth's exosphere, astronautics) The region of space near the Earth.
n
(rare) Alternative spelling of off-worlder [(science fiction, fantasy) One who is not from the local planet/world/plane/dimension/universe.]
n
(science fiction, fantasy) One who is not from the local planet/world/plane/dimension/universe.
adv
(chiefly science fiction) Away from Earth.
adv
(science fiction) Between planets (in the same or different system).
n
A variation of the hypothetical process of terraforming in which a transparent dome is built over most or all of the sterile planet to work as a giant greenhouse or "worldhouse".
adj
Among or around the stars.
adj
flat, flattened. Resembling a plane, or otherwise planar.
n
Earth; the third planet in the Solar System
n
(astronomy, obsolete) A theoretical planet responsible for observed gravitational perturbations of Uranus' orbit. (This planet was discovered and is now known as Neptune.)
adj
Synonym of planet-struck
adj
(archaic) Afflicted by the astrological influence of a planet; struck down with amazement or shock; panic-stricken.
n
(science fiction, rare) Membership of a particular planet or moon, by origin, birth, naturalization, ownership, allegiance or otherwise.
n
An inhabitant of a planet
adj
(poetic, obsolete) Of or relating to planets.
n
(science fiction) The arrival of a spacecraft on the surface of a planet.
n
(astronomy) The state or condition of being a planet.
adj
(science fiction) On a planet.
adj
(astrology) Pertaining to the astrological influence of Pluto, formerly regarded as a planet.
adj
Prior to the formation of Earth
adj
Of or pertaining to the early stages in the formation of a planet.
n
The planet Saturn at an early stage.
n
(science fiction) Some inhabited planet of the Proxima Centauri system.
adj
(science fiction, rare) Of or relating to Proxima Centauri.
adj
Of a coordinate system, based on the Moon.
adj
(astronomy, of a star) Having similar characteristics to those of the Sun.
adj
(astronomy, rare) Moving towards the sun.
adj
(obsolete, rare) Relating to the Sun and Earth.
adj
Pertaining to a solstice.
n
Investigation of interplanetary or interstellar space, its properties, biology and the bodies that exist within it.
adj
Relating to, or characteristic of, the genre of space opera.
adj
based in space (especially in orbit, but sometimes on a planet or moon)
n
A type of otherkin that identifies as an astronomical body.
n
(informal) An extraterrestrial person who visits from a different star system.
n
Alternative form of starmaker [One who works at turning others into famous and successful entertainers.]
n
One who works at turning others into famous and successful entertainers.
n
(science fiction) An inhabitant of a star.
n
Alternative form of star seed [A person who lived a previous lifetime in one star system but was then reincarnated in another star system.]
adj
Below the stars; earthly, terrestrial, mundane.
adj
Below the stratosphere.
adj
(of a planet, etc.) Even better suited than Earth for the emergence and evolution of life.
adj
Alternative form of super-Jovian [(astronomy) More massive than the planet Jupiter; relating to a super-Jupiter]
adj
Above or beyond the Moon (from a vantage point on Earth).
adj
Above the surface of a planet
adj
Situated or taking place above or outside the limits of space.
adj
Above the Earth or earthly concerns.
adj
Beyond the Moon; hence, very lofty.
n
Any planet of the solar system or any exoplanet which is "Earth-like" in the sense that it is composed primarily of metals and rock, in contrast to a planet which is a gas giant.
n
(astronomy) A substance capable of forming a planetary ocean.
n
(astronomy) A habitable planet with a surface temperature of 50–100°C, warmer than is optimal for most terrestrial life.
adj
lying beyond the orbit of the planet Neptune (especially with regard to planetary bodies)
adj
(of a spaceflight or trajectory) Towards the earth from the moon or another planet.
adj
Alternative form of trans-Neptunian [lying beyond the orbit of the planet Neptune (especially with regard to planetary bodies)]
adj
(chiefly science fiction) Across or between the stars.
adj
Of or pertaining to the hypothetical Solar System planet Vulcan or proposed asteroid belt in the same orbit about the Sun.
n
A small planet; planetoid.
n
Abbreviation of extraterrestrial. [A being originating from outside of the Earth's atmosphere, from space, or from another planet; an alien]
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