All articles starting with S
44,216 articles
Space-time wave packet
A space-time wave packet (STWP) is a pulsed optical field whose spatial and temporal frequencies are tied one-to-one, so it propagates without diffraction or dispersion.
Space-time white noise
Space-time white noise is a Gaussian random field with independent values at every point of time and space, the standard forcing term for stochastic partial differential equations.
Space-time-coding metasurfaces
Space-time-coding metasurfaces (STCMs) are programmable arrays of sub-wavelength scattering units that steer beams and redistribute power among frequency harmonics, extending digital coding metasurfaces to applications like integrated sensing and communication.
Space–time yield
Space–time yield (STY) is a chemical engineering metric measuring product formed per unit of reactor volume per unit of time, used to compare reactors and bioprocesses.
Space: 1999
Space: 1999 is a British science-fiction TV series (1975-1977) created by Gerry and Sylvia Anderson for ITC, in which a 1999 nuclear waste explosion blasts the Moon, and Moonbase Alpha's 311-person crew, into deep space.
Space: Above and Beyond
Space: Above and Beyond (also Space 2063) is a 1995-1996 Fox military sci-fi series by Glen Morgan and James Wong about the Wildcards squadron fighting the Chigs; cancelled after 23 episodes, it influenced Battlestar Galactica and Firefly.
Space.com
Space.com is an American online publication covering space exploration, astronomy, and spaceflight, founded in 1999 by Lou Dobbs and owned since 2018 by Future plc.
Spaceballs
Spaceballs is a 1987 American science fiction parody film directed by Mel Brooks that satirizes Star Wars, starring Bill Pullman, John Candy, and Rick Moranis.
Spaceballs: The New One
Spaceballs: The New One is the Amazon MGM Studios sequel to Mel Brooks's 1987 sci-fi parody Spaceballs, releasing theatrically April 23, 2027, directed by Josh Greenbaum, with returning cast Rick Moranis, Bill Pullman, Daphne Zuniga, George Wyner, and Brooks.
SpaceBEE
SpaceBEE, short for Basic Electronic Elements, is a series of 0.25U CubeSats built by Swarm Technologies for Internet-of-Things messaging, penalized $900,000 by the FCC after a 2018 unauthorized launch.
SpaceBok
SpaceBok is a quadruped research robot built by ETH Zurich and ZHAW students from 2018 to 2021 to study jumping locomotion for exploring the Moon, Mars, and asteroids.
Spaceborne entanglement distribution
Spaceborne entanglement distribution delivers quantum-entangled photon pairs via satellites and free-space optical links instead of fiber, first demonstrated by China's Micius satellite over 1,203 km in 2017.
Spacebus
Spacebus is a family of satellite buses for geostationary telecommunications satellites, developed in France since 1985 and now produced by Thales Alenia Space, from Spacebus 100 to all-electric Spacebus Neo.
SpaceCamp
SpaceCamp is a 1986 American family adventure film directed by Harry Winer. It tells the story of teenagers accidentally launched into orbit, and inspired real Space Camp attendance.
SPACECOOL
SPACECOOL is a Tokyo decarbonization materials company founded in 2021 as a carve-out from Osaka Gas, selling a zero-energy film that cools surfaces below air temperature in sunlight.
Spacecraft
A spacecraft is a vehicle, or flight system, designed to operate in space for missions from orbiting Earth to landing on another planet, ranging from crewed Apollo vehicles to four-inch CubeSats.
Spacecraft assembly and integration facility
A spacecraft assembly and integration facility is a controlled industrial building where spacecraft are built up from parts, integrated, and tested in cleanrooms and environmental test halls before launch.
Spacecraft bus
A spacecraft bus is the part of a spacecraft that supports its payload with power, thermal control, attitude control, and communications, also called the satellite platform.
Spacecraft by launch vehicle
Spacecraft by launch vehicle is a classification scheme that groups uncrewed spacecraft by rocket family rather than mission or orbit, using families like Soyuz, Atlas, Delta, and Proton.
Spacecraft cemetery
The spacecraft cemetery, also called the South Pacific Ocean Uninhabited Area, is a region around Point Nemo where space agencies deliberately deorbit large spacecraft, including the Mir station in 2001.
Spacecraft decommissioning and disposal
Spacecraft decommissioning and disposal is the end-of-life phase of a space mission, in which a spacecraft is deactivated and moved out of its operating orbit to prevent orbital debris.
Spacecraft design
Spacecraft design is the engineering discipline of creating a vehicle that carries a payload through launch, survives the space environment, and performs its mission by trading mass, power, cost, and reliability across every subsystem.
Spacecraft propulsion
Spacecraft propulsion, also called space propulsion, is the set of technologies a spacecraft uses to change velocity by expelling mass or momentum, with chemical, electric, nuclear, and propellantless families.
Spacecraft reentries, 1958–1969
Spacecraft reentries, 1958–1969 spans the first satellite decays to Apollo lunar returns at about 11 km/s, when reentry became routine and capsules were first recovered.
Spacecraft reentries, 2020–2023
Spacecraft reentries, 2020–2023 covers satellites, rocket stages, and debris returning to Earth's atmosphere, with cataloged objects rising from 878 in 2020 to 2,085 in 2023.
Spaced
Spaced is a British Channel 4 sitcom (1999–2001, 14 episodes) created by Simon Pegg and Jessica Hynes, directed by Edgar Wright, about strangers Tim Bisley and Daisy Steiner who pose as a couple to rent a North London flat, blending slacker realism with cinematic pop-culture homages.
Spaced Invaders
Spaced Invaders (1990), originally Martians!!!, is a Touchstone sci-fi comedy directed by Patrick Read Johnson, in which Martians mishear a War of the Worlds rebroadcast and land in Big Bean, Illinois on Halloween; grossed about $14.3 million.
Spaced learning
Spaced learning is a study method in which learning sessions are separated by time intervals rather than delivered back to back, exploiting the spacing effect to improve long-term retention.
Spaced repetition
Spaced repetition, also called spaced retrieval or distributed practice, schedules reviews of learned material at increasing time intervals to improve long-term retention. Rooted in Ebbinghaus's 1885 spacing effect, implemented in tools like Anki (SM-2, FSRS algorithms), and validated in large medical education trials.
Spaceflight
Spaceflight is the flight of vehicles into and through outer space, achieved by launching on rockets that carry their own propellant, spanning human and robotic spaceflight.