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Type of classification of molecular orbitals
In quantum chemistry, a complete active space (CAS) is a systematic classification of molecular orbitals used to construct multireference wavefunctions
Complete_active_space
Method in quantum chemistry
interaction (MRCI) or multi-reference perturbation theories like complete active space perturbation theory (CASPT2). These methods can deal with extremely
Multi-configurational self-consistent field
Multi-configurational_self-consistent_field
Complete active space perturbation theory (CASPTn) is a multireference electron correlation method for computational investigation of molecular systems
Complete active space perturbation theory
Complete_active_space_perturbation_theory
Computational chemistry software
general and effective multiconfigurational SCF calculations at the Complete Active Space (CASSCF) level, but also employing more restricted MCSCF wave functions
MOLCAS
Chemical compound
tetraammoniate of lithium ozonide was found to be -135 ± 5 kcal/mol. Complete active space self-consistent field (CASSCF) methods have been used to calculate
Lithium_ozonide
Activity fraction of a periodic system
or system is active. Duty cycle is commonly expressed as a percentage or a ratio. A period is the time it takes for a signal to complete an on-and-off
Duty_cycle
American spaceflight and AI company
Space Exploration Technologies Corp., doing business as SpaceX, is an American spaceflight, telecommunications, and artificial intelligence company headquartered
SpaceX
Concept in quantum chemistry
s , … {\displaystyle r,s,\ldots } denote core, active and virtual orbitals (see Complete active space) respectively, ε i {\displaystyle \varepsilon _{i}}
Dyall_Hamiltonian
second-order Møller–Plesset perturbation theory to multireference complete active space cases. The theory is directly integrated into many quantum chemistry
N-electron valence state perturbation theory
N-electron_valence_state_perturbation_theory
Computational chemistry software
PW91, LYP, PL, P86, B95 ONIOM (QM/MM method) up to three layers Complete active space (CAS) and multi-configurational self-consistent field calculations
Gaussian_(software)
This is a list of active space probes which have escaped Earth orbit. It includes lunar space probes, but does not include space probes orbiting at the
List of active Solar System probes
List_of_active_Solar_System_probes
29. Church 2023, p. 123. "Air Force's Last Active-Duty F-15C Made Its Final Flight at Kadena". Air and Space Forces. 1 April 2025. Retrieved 9 April 2025
List of active United States military aircraft
List_of_active_United_States_military_aircraft
Modular space station in low Earth orbit
The International Space Station (ISS) is a space station in low Earth orbit (LEO). It is the product of the International Space Station program and is
International_Space_Station
NASA infrared space telescope
Roman Space Telescope (shortened as the Roman Space Telescope, Roman, NGRST, or RST) is a NASA infrared space telescope whose construction was completed on
Nancy Grace Roman Space Telescope
Nancy_Grace_Roman_Space_Telescope
Quantum chemistry software program
integral package. Bofill executed an unhindered natural orbital-complete active space (UNO-CAS) program including analytical gradients; this is a minimal-cost
PQS_(software)
NASA/ESA/CSA space telescope launched in 2021
The James Webb Space Telescope (JWST) is a space telescope designed to conduct infrared astronomy. It is the largest telescope in space, and is equipped
James_Webb_Space_Telescope
NASA/ESA space telescope launched in 1990
The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the
Hubble_Space_Telescope
American space and aeronautics agency
Aeronautics and Space Administration (NASA /ˈnæsə/) is an independent agency of the U.S. federal government responsible for the United States' civil space program
NASA
Category of computational quantum chemistry technique
interaction (MRCI) n-electron valence state perturbation theory (NEVPT) Complete active space perturbation theory (CASPTn) State universal multi-reference coupled-cluster
Ab initio quantum chemistry methods
Ab_initio_quantum_chemistry_methods
Russian cosmonaut and politician (born 1937)
officer after completing her training. After the dissolution of the first group of female cosmonauts in 1969, Tereshkova remained in the space programme as
Valentina_Tereshkova
Ab initio quantum chemistry software package
and Knowles developed on a new generation program called CASSCF (complete active space SCF). This new CASSCF program combined fast orbital optimization
MOLPRO
Unmanned robotic spacecraft
A space probe is an uncrewed robotic spacecraft designed to explore outer space and transmit scientific data back to Earth. Space probes are used to investigate
Space_probe
SpaceX satellite Internet constellation
approximately 75% of all active maneuverable satellites in Earth orbit and had more than 12 million subscribers as of June 2026. In May 2018, SpaceX estimated the
Starlink
National space agency of the People's Republic of China
National Space Administration (CNSA) is the national space agency of China. Headquartered in Haidian, Beijing, it is responsible for China's civil space programs
China National Space Administration
China_National_Space_Administration
Indian national space and aeronautics agency
The Indian Space Research Organisation (ISRO /ˈɪsroʊ/) is the national space agency of India, headquartered in Bengaluru, Karnataka. It serves as the
ISRO
1991 multicart video game compilation
construction tools. Active Enterprises advertised a contest involving Ooze, the fifth game of the NES version. Players who could complete Level 6 of the game
Action_52
End of NASA Space Shuttle program in 2011
NASA's Space Shuttle fleet took place from March to July 2011. Discovery was the first of the three active Space Shuttles to be retired, completing its final
Space_Shuttle_retirement
Chinese modular space station (since 2021)
to complete Tiangong space station". Space News. David, Leonard (30 April 2021). "China's new space station will need 10 more launches to complete". Space
Tiangong_space_station
Crash of rocket into the Moon
other space assets, the impact renewed attention to space law regarding space junk and space archaeology, and to the larger context of the Second Space Race
2026_SpaceX_lunar_impact
television series Lost in Space. All episodes in black-and-white All episodes in Seasons 2 and 3 filmed in color Complete box sets of all 3 seasons (and
List of Lost in Space episodes
List_of_Lost_in_Space_episodes
Award of the United States armed forces
announced on 29 April 2010. It is awarded to active duty members on a permanent assignment and who successfully complete a tour of duty of at least 12 months
Overseas_Service_Ribbon
Partially reusable launch system and space plane
Five complete Space Shuttle orbiter vehicles were built and flown on a total of 135 missions from 1981 to 2011. They launched from the Kennedy Space Center
Space_Shuttle
Active duty US three-star military officers
States rear admirals List of active duty United States Air Force major generals List of active duty United States Space Force general officers List of
List of active duty United States three-star officers
List_of_active_duty_United_States_three-star_officers
Billionaire space rivalry
The billionaire space race is the rivalry among entrepreneurs who have entered the space industry from other industries – particularly computing. This
Billionaire_space_race
Egyptian mountain climber
launched Make Space Yours, a multi-year initiative aimed at helping others pursue the path to space that he had been unable to complete. The program focused
Omar_Samra
Compact region at a galaxy's center with abnormally high luminosity
arXiv:2203.00929. doi:10.1093/mnras/stac542. ISSN 0035-8711. Media related to Active galactic nuclei at Wikimedia Commons Portals: Astronomy Stars Outer space
Active_galactic_nucleus
Type of soldier in military science fiction
featuring the same characters using a spaceship with active camouflage to free hostages from Martian space pirates on Ganymede. A more widely known early example
Space_marine
Space Shuttle orbiter (1981–2003)
Columbia was flown on 28 missions in the Space Shuttle program, spending over 300 days in space and completing over 4,000 orbits around Earth. NASA's flagship
Space_Shuttle_Columbia
Pollution around Earth by defunct artificial objects
Space debris (also known as space junk, space pollution, space waste, space trash, space garbage, or cosmic debris) are defunct human-made objects in space –
Space_debris
Marine Corps, and 21 for the Space Force. For the Army, Marine Corps, Navy and Air Force, no more than 28% of each service's active-duty general or flag officers
List of active duty United States four-star officers
List_of_active_duty_United_States_four-star_officers
Businessman (born 1971)
former public official who is the CEO and largest shareholder of Tesla and SpaceX. Musk has been the wealthiest person in the world since 2025, and became
Elon_Musk
Computational problem
one side of a grid cell) and d is the configuration space dimension. Probabilistic completeness is the property that as more "work" is performed, the
Motion_planning
Investigation of outer space
Space exploration is the physical investigation of outer space by uncrewed robotic space probes and through human spaceflight. While the observation of
Space_exploration
Combined military forces of the United States
Should it be called into active duty again, it would constitute a seventh branch of the Armed Forces. The United States Space Force was established as
United_States_Armed_Forces
Fictional artefacts from Arthur C. Clarke's ''Space Odyssey'' novels
In Arthur C. Clarke's Space Odyssey series, Monoliths are machines in black cuboids whose sides extend in the precise ratio of 1 : 4 : 9 (12 : 22 : 32)
Monolith_(Space_Odyssey)
Air warfare branch of the Netherlands' armed forces
renamed the Royal Netherlands Air and Space Force. The aerobatic display team of the Royal Netherlands Air Force, active from 1979 until 2019, was the Solo
Royal Netherlands Air and Space Force
Royal_Netherlands_Air_and_Space_Force
American social networking service
Within 10 days, the first version of MySpace was ready for launch, implemented using ColdFusion. A complete infrastructure of finance, human resources
Myspace
1972–2011 United States human spaceflight program
When its mission was complete, the orbiter would reenter the Earth's atmosphere and land like a glider at either the Kennedy Space Center or Edwards Air
Space_Shuttle_program
US–USSR spaceflight capability rivalry
of its Space Shuttle orbiter on a Boeing 747 carrier plane on August 12, 1977, and the first orbital test flight of a complete, crewed Space Shuttle
Space_Race
Quebec and 4 Wing Cold Lake, Alberta; 60 CF-18As and 25 CF-18Bs remain in active service. McDonnell Douglas F/A-18 Hornet (Ex-RAAF) 18 (12 F/A-18A and 6
List of active Canadian military aircraft
List_of_active_Canadian_military_aircraft
Parametrizes complex structures on a surface
structures is an active body of research. The sub-field of mathematics that studies the Teichmüller space is called Teichmüller theory. Moduli spaces for Riemann
Teichmüller_space
Mathematical set with some added structure
Bergman space Berkovich space Besov space Borel space Calabi-Yau space Cantor space Cauchy space Cellular space Chu space Closure space Conformal space Complex
Space_(mathematics)
French engineer, helicopter pilot and astronaut (born 1982)
pilot, and astronaut. She holds the rank of colonel in the French Air and Space Force and became France's first female helicopter test pilot in 2018. She
Sophie_Adenot
American aerospace company
development". SpaceNews. Retrieved October 10, 2023. @stoke_space (April 5, 2024). "🚀Stage 1 engine assembly, checkout, shipping, install complete. ✅ Still
Stoke_Space
American internet entrepreneur (born 1970)
Retrieved February 14, 2010. Rosenbush, Steve (July 29, 2005). "MySpace: WhoseSpace?". BusinessWeek. Archived from the original on July 31, 2005. Retrieved
Tom_Anderson
Private American aerospace company
Axiom Space, Inc., is an American privately funded space infrastructure developer headquartered in Houston, Texas. Founded in 2016 by Michael T. Suffredini
Axiom_Space
1996 film by Joe Pytka
Space Jam is a 1996 American live-action animated sports comedy film directed by Joe Pytka and written by Leo Benvenuti, Steve Rudnick, Timothy Harris
Space_Jam
2015 space flight simulation video game
Kerbal Space Program is a 2015 space flight simulation video game developed by Mexican studio Squad for Linux, macOS, Windows, PlayStation 4, PlayStation
Kerbal_Space_Program
Concept of permanent human habitation outside of Earth
considerable number of space colonization advocates and groups are active. Currently, the dominant private launch provider SpaceX, has been the most prominent
Space_colonization
Extreme benchmarks set off Earth by astronauts, launchers and probes
travelers with the most total time in space are: Color key: Currently in space Active Retired Deceased NASA astronaut Christina Koch holds the record
List_of_spaceflight_records
times) being the most reflown active and passive fairing halves respectively. Typical missions include launches of SpaceX's Starlink satellites (accounting
List of Falcon 9 and Falcon Heavy launches
List_of_Falcon_9_and_Falcon_Heavy_launches
Space station program of the People's Republic of China
international space-active countries. The program is part of the China Manned Space Program that began in 1992. The core module of the Tiangong space station
Tiangong_program
USAF/NASA R&D aircraft
F-15 ACTIVE (graphics collection), Dryden: NASA, archived from the original on 19 February 2003. "Sonic Solutions", Aviation Week & Space Technology
McDonnell Douglas F-15 STOL/MTD
McDonnell_Douglas_F-15_STOL/MTD
Mathematical model combining space and time
In physics, spacetime, or the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into
Spacetime
American astronomer (1925–2018)
her foundational role in planning the Hubble Space Telescope. Throughout her career, Roman was an active public speaker and educator, and an advocate
Nancy_Roman
Launch facilities used by SpaceX
an exclusive commercial lease to SpaceX for use of mothballed space shuttle launch LC-39A." NASA planned to complete the bid award and have the pad transferred
SpaceX_facilities
Partially-reusable medium-lift launch vehicle by SpaceX
industry" had allowed SpaceX to complete the task at a substantially lower cost. "According to NASA's own independently verified numbers, SpaceX's development
Falcon_9
2020s class of partially reusable spacecraft
manufactured, and operated by the American space company SpaceX for flights to the International Space Station (ISS) and private spaceflight missions
SpaceX_Dragon_2
Computing feature predicting ending to a word a user is typing
is actively developed. IntelliComplete, available as both freeware and payware, works only in certain programs which hook into the IntelliComplete server
Autocomplete
NASA-led lunar exploration program
exploration program led by the United States' National Aeronautics and Space Administration (NASA), aimed at returning humans to the Moon for the first
Artemis_program
Spacecraft crew member
being "active ESA staff having successfully completed Basic Astronaut training recognised by ESA or who have participated in a mission to space". People
Astronaut
Research organization at the University of Colorado Boulder
supports 26 active space missions. Founded in 1948 as the Upper Air Laboratory, the first scientific instruments built at LASP were launched into space after
Laboratory for Atmospheric and Space Physics
Laboratory_for_Atmospheric_and_Space_Physics
European organisation dedicated to space exploration
The European Space Agency (ESA; pronounced /ˈiːsə/ EE-sə) is a 23-member international organisation devoted to space exploration. It has its headquarters
European_Space_Agency
American aerospace, space technology company
Retrieved 2024-01-01. Foust, Jeff (2023-11-06). "Sierra Space completes first Dream Chaser". SpaceNews. Retrieved 2024-01-01. Morgan Brennan (April 14, 2021)
Sierra_Space
Venus, Earth, Mars, and Saturn, including active artificial satellites and space junk Heliosphere, a bubble in space produced by the solar wind Heliosheath
List_of_Solar_System_objects
2019 video game
the Steam early access program. During the following years of active development, Space Engineers sold over one million units. As of 2024, the game has
Space_Engineers
SpaceX private launch site
SpaceX Starbase, previously known as SpaceX South Texas Launch Site and SpaceX private launch site, is an industrial complex and rocket launch facility
SpaceX_Starbase
Orbital debris removal company
The company is developing life extension, in-situ space situational awareness, end-of-life and active debris removal solutions. Astroscale was founded
Astroscale
Division of Airbus
Airbus Defence and Space is the military and space systems division of Airbus. It was formed in 2014 during the restructuring of the European Aeronautic
Airbus_Defence_and_Space
The European Space Agency (ESA) operates a number of space missions, both individually and in collaborations with other space agencies such as U.S. NASA
List of European Space Agency programmes and missions
List_of_European_Space_Agency_programmes_and_missions
Partially-reusable medium-lift launch vehicle
at sea, 1st launch in 2025". Space.com. Retrieved 10 March 2025. We’ve signed an agreement with @BollingerShip to complete the build-out of our 400ft landing
Rocket_Lab_Neutron
Survival horror game
Dead Space is a 2008 survival horror game developed by EA Redwood Shores and published by Electronic Arts. It was released for PlayStation 3, Xbox 360
Dead_Space_(2008_video_game)
Space exploration program conducted by the Soviet Union from 1951 to 1991
space program (Russian: Космическая программа СССР, romanized: Kosmicheskaya programma SSSR) was the state space program of the Soviet Union, active from
Soviet_space_program
1982 Japanese film
golden age of anime sci-fi, it's because of things like Space Adventure Cobra". Sandra Scholes of Active Anime commented it reminded "Barbarella, Zardoz and
Space Adventure Cobra: The Movie
Space_Adventure_Cobra:_The_Movie
Type of phased-array radar
An active electronically scanned array (AESA) is a type of phased array antenna, which is a computer-controlled antenna array in which the beam of radio
Active electronically scanned array
Active_electronically_scanned_array
American experimental spaceplane
length of the wing; this increases drag while retaining stability. SpaceShipOne completed the first crewed private spaceflight in 2004. That same year, it
SpaceShipOne
US space base in Greenland
Pituffik Space Base (/biːduːˈfiːk/, bee-doo-FEEK; Greenlandic: [pitufːik]; IATA: THU, ICAO: BGTL), formerly Thule Air Base (/ˈtuːliː/, TOO-lee), is a
Pituffik_Space_Base
2024 American crewed spaceflight to the ISS
from Cape Canaveral Space Launch Complex 40; astronaut Nick Hague was the first active U.S. Space Force Guardian to launch to space; and the mission was
SpaceX_Crew-9
Nonprofit mental health organization
and spring of each year. The Active Minds Emerging Scholars Fellowship provides an opportunity for students to complete funded, independent mental health
Active_Minds
Grace Roman Space Telescope, NASA's next great observatory, is finally complete". Space. Retrieved 23 April 2026. "China's giant Xuntian space telescope
2026_in_spaceflight
China has one of the most active space programs in the world. With launch vehicles of the Long March rocket family and four spaceports (Jiuquan, Taiyuan
Chinese_space_program
United States military award
Armed Forces, is currently awarded to any active duty enlisted member of the United States military who completes three consecutive years of "honorable and
Good Conduct Medal (United States)
Good_Conduct_Medal_(United_States)
Military award of the United States Armed Forces
authorized the ribbon to anyone who was on active duty in December 1986, regardless of when they completed initial accession training. The ribbon was
Air_and_Space_Training_Ribbon
Effort by SpaceX to make rockets that can fly multiple times
SpaceX recently completed at Kennedy Space Center Launch Complex 39. Returned rocket parts have also been transported to SpaceX Hawthorne and SpaceX
SpaceX reusable launch system development program
SpaceX_reusable_launch_system_development_program
Mathematical theory of the geometry of space and time
the intervening space. In contrast, Einstein denied that there is any background Euclidean reference frame that extends throughout space. Nor is there any
Curved_spacetime
Hypothesis in neuroscience
This principle approximates an integration of Bayesian inference with active inference, where sensory feedback refines prediction-guided actions. From
Free_energy_principle
Military academy in El Paso County, Colorado, US
commit to serving eight years (five active duty and three in reserves) as a commissioned officer in the Air Force or Space Force. Non-graduates after that
United States Air Force Academy
United_States_Air_Force_Academy
Human space travel for recreation
Space tourism is human space travel for recreational purposes. There are several different types of space tourism, including orbital, suborbital and lunar
Space_tourism
Smooth manifold with an inner product on each tangent space
Riemann space) is a geometric space on which many geometric notions such as distance, angles, length, volume, and curvature are defined. Euclidean space, the
Riemannian_manifold
and three large commercial satellites. After becoming the senior active rocket for SpaceX on December 25, 2023, it was assigned to what would become the
List of Falcon 9 first-stage boosters
List_of_Falcon_9_first-stage_boosters
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COMPLETE ACTIVE-SPACE
COMPLETE ACTIVE-SPACE
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COMPLETE ACTIVE-SPACE