Space Words That Start with S

There are so many astronomical objects out there behaving in mysterious ways that astronomers are still trying to figure out. A brand new set of words and language has to be invented every time something is discovered and that is part of what makes the study of space so interesting. There’s so much out there that is waiting to be found.

The use of mythological and ancient names to name all the objects that are in space has also always given astronomy an air of mystery and wonder that attracts all kinds of people and incentivizes them to look at the sky every night.

There are so many space-related words and terms that it is hard to keep up.

This is why below, we have compiled a list of space words that start with S so you can learn more about the study of the universe. These are words that are related to astronomy and space, if what you are looking for is specifically for name ideas or the names of objects, check out our lists of star names, planets, or constellations. You will also find those sorted by letter.

SagittaA small constellation named after an arrow.
SagittariusA zodiac constellation known as the “Archer,” home to the center of our galaxy.
SatelliteAn object that orbits a larger body, like a planet or moon.
Satellite ConstellationA group of satellites working together in a coordinated manner, often used for communication or Earth observation.
SaturnThe sixth planet from the Sun, known for its rings.
Saturn VA powerful rocket used by NASA for the Apollo moon missions.
Saturn’s RingsA system of ring particles orbiting around the planet Saturn.
Schwarzschild RadiusThe radius of a non-rotating black hole beyond which escape is impossible due to the strength of its gravitational pull.
ScorpiusA prominent zodiac constellation representing a scorpion.
Sculptor GalaxyA spiral galaxy in the constellation Sculptor, also known as NGC 253.
SednaA distant and reddish trans-Neptunian object, considered a potential dwarf planet.
SerpensA constellation representing a serpent, divided into Serpens Caput and Serpens Cauda.
SextansA faint constellation named after a sextant, an instrument used for navigation.
Shoemaker-Levy 9A comet that collided with Jupiter in 1994, creating spectacular impact events.
Sideral MonthThe time it takes for the Moon to complete one orbit around Earth with respect to distant stars.
Sidereal TimeA measure of time based on the position of distant stars.
SiriusThe brightest star in the night sky, part of the constellation Canis Major.
Sloan Great WallA massive cosmic structure, one of the largest known galaxy superstructures.
Small Magellanic CloudA dwarf galaxy near the Milky Way, visible from the Southern Hemisphere.
Solar ConstantThe amount of solar energy received per unit area at Earth’s distance from the Sun.
Solar EclipseWhen the Moon passes between the Sun and Earth, blocking the Sun’s light.
Solar FlareA sudden, intense burst of energy on the Sun’s surface.
Solar SystemThe collection of planets, moons, and other objects orbiting the Sun.
Solar WindA stream of charged particles ejected from the Sun’s corona.
Sombrero GalaxyA spiral galaxy located in the Virgo constellation, resembling a sombrero hat.
Space ElevatorA hypothetical structure to transport objects from Earth to space using a cable.
Space ExplorationThe investigation and discovery of celestial bodies and phenomena.
Space JunkUnwanted or defunct objects orbiting Earth that can pose a hazard to operational spacecraft.
Space ShuttleA reusable spacecraft used by NASA for human spaceflight missions.
Space StationA large, habitable structure in space for research and living.
Space TourismCommercial space travel for recreational or leisure purposes.
Space-TimeThe four-dimensional continuum that combines space and time in Einstein’s theory of relativity.
Space-time ContinuumThe unified concept of space and time as a four-dimensional structure in Einstein’s theory of relativity.
SpacecraftA vehicle designed for travel or operation in outer space.
SpacewalkAn activity in which an astronaut floats outside a spacecraft, typically for repairs or experiments.
SpicaThe brightest star in the constellation Virgo.
Spindle GalaxyA peculiar galaxy with a spindle-like shape, also known as NGC 5866.
Spiral GalaxyA type of galaxy characterized by a spiral structure of arms surrounding a central nucleus.
Spitzer Space TelescopeA space-based infrared telescope used for astronomical observations.
SputnikThe first artificial satellite launched into Earth’s orbit by the Soviet Union.
StarA luminous celestial object composed of hot plasma.
Star CatalogA compilation of information about stars, often including their positions, brightness, and spectral characteristics.
Star ClusterA group of stars that are gravitationally bound.
Star SystemA group of stars that are gravitationally bound and often orbit a common center of mass.
Starburst GalaxyA galaxy undergoing a rapid and intense period of star formation.
StarlightThe light emitted by stars.
StarquakeA sudden release of energy from a star’s interior, causing the star’s surface to shake.
Stellar NurseryA region of space where new stars are forming.
Suborbital FlightA spaceflight that reaches the edge of space but does not complete a full orbit around a celestial body.
SunThe star at the center of our solar system.
SunspotsTemporary dark spots on the Sun’s surface caused by magnetic activity.
SuperclusterA large group of galaxy clusters held together by gravity.
Supergiant StarAn extremely large and luminous star in its late stages.
Supermassive Black HoleAn extremely massive black hole found at the centers of galaxies.
SupernovaA powerful and luminous stellar explosion.
Swan NebulaA star-forming region in the Milky Way, also known as M17 or Omega Nebula.
Symbiotic StarA binary star system consisting of a red giant and a hot companion star.
Synodic PeriodThe time it takes for a celestial body (e.g., a planet) to return to the same relative position as observed from Earth.
space words that start with the letter S

Find more space words that start with other letters: