deep-space
Far past Saturn
Deep-space refers to regions of outer space far beyond Earth's immediate neighborhood—typically beyond the Moon's orbit or outside the solar system entirely.
The term appears most often in discussions of exploration and communication: deep-space probes, deep-space network.
It evokes the vast, empty distances between celestial bodies where spacecraft operate largely on their own.
Gravitationally bound stellar mass
- nebulaInterstellar gas formation
- supernovaExploding massive star
- pulsarMagnetized rotating neutron emitter
- starshipFictional interstellar vessel
voyager · exoplanet · light-year · cosmic ray · stellar nursery · star system · binary star · neutron star
Complete system or domain
- big bangLoud explosive noise
- dark energyForce accelerating universal expansion
- dark matterLightless cosmic mass
- quasarLuminous active galactic core
black hole · cosmic inflation · gravitational waves · nucleosynthesis · galaxy cluster · observable universe · primordial · singularity
Being from outer space
- alienNon-native being
- enigmaSomething hard to fathom
- mysterySomething unexplained or unknown
- unexploredNot yet investigated
frontier · uncharted · anomaly · phenomenon · discovery · exploration · pioneer · SETI
Absence of matter
- emptinessAbsence of substance
- expanseUnbroken area of space
- nothingnessComplete absence of existence
- silenceTotal lack of sound
isolation · vastness · desolation · barrenness · cold · darkness · radiation · sparse
Without any boundaries
- limitlessWithout any boundaries
- endlessWithout termination or boundary
- infiniteHaving no bounds
- vastnessState of being immense
immeasurable · unfathomable · incomprehensible · cosmic scale · astronomical · parsec · megaparsec · billions
galaxy
Gravitationally bound stellar mass
- nebulaInterstellar gas formation
- supernovaExploding massive star
- pulsarMagnetized rotating neutron emitter
starship · voyager · exoplanet · light-year · cosmic ray · stellar nursery · star system · binary star · neutron star · magnetar
universe
Complete system or domain
- big bangLoud explosive noise
- dark energyForce accelerating universal expansion
- dark matterLightless cosmic mass
quasar · black hole · cosmic inflation · gravitational waves · nucleosynthesis · galaxy cluster · observable universe · primordial · singularity
extraterrestrial
Being from outer space
unexplored · frontier · uncharted · anomaly · phenomenon · discovery · exploration · pioneer · SETI · astrobiology
vacuum
Absence of matter
- emptinessAbsence of substance
- expanseUnbroken area of space
- nothingnessComplete absence of existence
silence · isolation · vastness · desolation · barrenness · cold · darkness · radiation · sparse · intergalactic
boundless
Without any boundaries
vastness · immeasurable · unfathomable · incomprehensible · cosmic scale · astronomical · parsec · megaparsec · billions · trillions
deep-spaceEarth orbit
Path around our planet
orbital · cislunar · lunar · suborbital · geocentric
deep-spaceterrestrial
Relating to land
earthbound · ground-based · planetary · atmospheric · surface
deep, space, depth, spacious, spaceship, spacecraft, spatial, spacer, spaceflight