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Near-rectilinear Halo Orbit
In orbital mechanics a near-rectilinear halo orbit (NRHO) is a halo orbit that passes close to the smaller of two astronomical object, bodies and has nearly stable behavior. The CAPSTONE mission, launched in 2022, is the first spacecraft to use such orbit in cislunar space, and this Moon-centric orbit is planned as a staging area for future lunar missions. In contrast with low lunar orbit which NASA characterizes as being deep in the lunar gravity well, NRHO is described as being "balanced on the edge" of the gravity well. The NRHOs are a subset of the halo families. This orbit type could also be used with other Minor planet, bodies in the Solar System and beyond. Association with Lagrange points A halo orbit is a periodic, three-dimensional orbit associated with one of the Lagrange points. Near-rectilinear means that some segments of the orbit have a greater curvature than those of an elliptical orbit of the same maximum diameter, and other segments have a curvature less t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Near Rectilinear Halo Orbit (NRHO)
NEAR or Near may refer to: People * Thomas J. Near, US evolutionary ichthyologist * Near (programmer), Near, a developer who created the higan (emulator), higan emulator Science, mathematics, technology, biology, and medicine * National Emergency Alarm Repeater (NEAR), a former alarm device to warn civilians of a foreign nuclear attack on the United States * National Emergency Airway Registry (NEAR), a patient registry for intubations in the United States * Nicking enzyme amplification reaction (NEAR), a method of DNA amplification * NEAR Protocol, a layer-1 blockchain * NEAR Shoemaker, a spacecraft that studied the near-Earth asteroid Eros * Nearness or proximity space *"Near", a city browser by NearGlobal * Near space, the upper atmosphere below outer space Television, film, music, and books * Near (Death Note), ''Nate River'', a character Other uses * Near v. Minnesota, a U.S. press freedom Supreme Court decision * New England Auto Racers Hall of Fame {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States's civil list of government space agencies, space program, aeronautics research and outer space, space research. National Aeronautics and Space Act, Established in 1958, it succeeded the National Advisory Committee for Aeronautics (NACA) to give the American space development effort a distinct civilian orientation, emphasizing peaceful applications in space science. It has since led most of America's space exploration programs, including Project Mercury, Project Gemini, the 1968–1972 Apollo program missions, the Skylab space station, and the Space Shuttle. Currently, NASA supports the International Space Station (ISS) along with the Commercial Crew Program and oversees the development of the Orion (spacecraft), Orion spacecraft and the Sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering Water distribution on Earth, 70.8% of Earth's crust. The remaining 29.2% of Earth's crust is land, most of which is located in the form of continental landmasses within Earth's land hemisphere. Most of Earth's land is at least somewhat humid and covered by vegetation, while large Ice sheet, sheets of ice at Polar regions of Earth, Earth's polar polar desert, deserts retain more water than Earth's groundwater, lakes, rivers, and Water vapor#In Earth's atmosphere, atmospheric water combined. Earth's crust consists of slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's outer core, Earth has a liquid outer core that generates a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar Lander
A lunar lander or Moon lander is a Lander (spacecraft), spacecraft designed to Moon landing, land on the surface of the Moon. As of 2024, the Apollo Lunar Module is the only lunar lander to have ever been used in human spaceflight, completing six lunar landings from 1969 to 1972 during the United States, United States' Apollo program, Apollo Program. Several robotic landers have reached the surface, and some have returned Moon rock, samples to Earth. The design requirements for these landers depend on factors imposed by the payload, flight rate, propulsive requirements, and configuration constraints. Other important design factors include overall energy requirements, mission duration, the type of mission operations on the lunar surface, and life support system if crewed. The relatively high gravity (higher than all known asteroids, but lower than all Solar System planets) and lack of Atmosphere of the Moon, lunar atmosphere negates the use of aerobraking, so a lander must use pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orion (spacecraft)
Orion (Orion Multi-Purpose Crew Vehicle or Orion MPCV) is a partially reusable crewed spacecraft used in NASA's Artemis program. The spacecraft consists of a Crew Module (CM) space capsule designed by Lockheed Martin that is paired with a European Service Module (ESM) manufactured by Airbus Defence and Space. Capable of supporting a crew of four beyond low Earth orbit, Orion can last up to 21 days undocked and up to six months docked. It is equipped with solar panels, an automated docking system, and glass cockpit interfaces. Orion is launched atop a Space Launch System (SLS) rocket, with a tower launch escape system. Orion was conceived in the early 2000s by Lockheed Martin as a proposal for the Crew Exploration Vehicle (CEV) to be used in NASA's Constellation program and was selected by NASA in 2006. Following the cancellation of the Constellation program in 2010, Orion was extensively redesigned for use in NASA's Journey to Mars initiative; later named Moon to Mars. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbital Rendezvous
Orbital may refer to: Sciences Chemistry and physics * Atomic orbital * Molecular orbital * Hybrid orbital Astronomy and space flight * Orbit ** Earth orbit Medicine and physiology * Orbit (anatomy), also known as the ''orbital bone'' * Orbitofrontal cortex, a part of the brain used for decision making Business * Orbital Corporation, an Australian engine technology company * Orbital Sciences Corporation, a U.S. satellite launch and defense systems corporation * Orbital ATK, American aerospace manufacturer formed from the merger of Orbital Sciences Corporation and parts of Alliant Techsystems Transportation * Ring road (or ''orbital road'' in some regions) * Orbital (metro), a rapid transit line usually encircling a city centre * Orbital engine Other uses * ''Orbital'' (novel), a 2023 novel by Samantha Harvey * Orbital (The Culture), artificial worlds from Iain M. Banks's series of science fiction novels, the Culture * Orbital (band), an English electronic dance music duo, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Artemis 3
Artemis III is planned to be the first crewed Moon landing mission of the Artemis program and the first crewed flight of the Starship HLS lander. Artemis III is planned to be the second crewed Artemis mission and the first crewed lunar landing since Apollo 17 in December 1972. , NASA officially expects Artemis III to launch no earlier than mid-2027 due to heat shield issues on Orion (spacecraft), Orion and valve problems in the spacecraft's life support system. In August 2023, due to delays in the development of SpaceX Starship, Starship, NASA officials expressed an openness to flying Artemis III without a crewed landing. In this case, the mission may become a crewed visit to the Lunar Gateway. In April 2024, it was reported that alternative mission options being internally evaluated by NASA include a test of docking between Orion and Starship HLS in low Earth orbit. Due to the second Trump administration's fiscal year 2026 budget proposal, which involves major budget cuts for N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar South Pole
The lunar south pole is the southernmost point on the Moon. It is of interest to scientists because of the lunar water, occurrence of water ice in Crater of eternal darkness, permanently shadowed areas around it. The lunar south pole region features craters that are unique in that the near-constant sunlight does not reach their interior. Such craters are cold trap (astronomy), cold traps that contain fossil records of hydrogen, water ice, and other volatiles dating from the Formation and evolution of the Solar System, early Solar System. In contrast, the lunar north pole region exhibits a much lower quantity of similarly sheltered craters. Geography The lunar south pole is located on the center of the polar Antarctic Circle (80°S to 90°S).Lunar South Pole. NASA. 2017. Accessed on 16 July 20 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar North Pole
The lunar north pole is the point in the Northern Hemisphere of the Moon where the lunar axis of rotation meets its surface. The lunar North Pole is the northernmost point on the Moon, lying diametrically opposite the lunar south pole. It defines latitude 90° North. At the lunar north pole all directions point south; all lines of longitude converge there, so its longitude can be defined as any degree value. Craters Notable craters in the lunar north polar region (between 60° North latitude and the North pole) include: Avogadro, Bel'kovich, Brianchon, Emden, Gamow, Goldschmidt, Hermite, J. Herschel, Meton, Nansen, Pascal, Petermann, Philolaus, Plaskett, Pythagoras, Rozhdestvenskiy, Schwarzschild, Seares, Sommerfeld, Stebbins, Sylvester, Thales, Van't Hoff, W. Bond, and Whipple. Exploration The Astrobotic Technology Icebreaker mission was a mission concept planned for a 2015 mission, then delayed to 2016, and then cancelled. It was meant as a competition t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbital Eccentricity
In astrodynamics, the orbital eccentricity of an astronomical object is a dimensionless parameter that determines the amount by which its orbit around another body deviates from a perfect circle. A value of 0 is a circular orbit, values between 0 and 1 form an elliptic orbit, 1 is a parabolic escape orbit (or capture orbit), and greater than 1 is a hyperbola. The term derives its name from the parameters of conic sections, as every Kepler orbit is a conic section. It is normally used for the isolated two-body problem, but extensions exist for objects following a rosette orbit through the Galaxy. Definition In a two-body problem with inverse-square-law force, every orbit is a Kepler orbit. The eccentricity of this Kepler orbit is a non-negative number that defines its shape. The eccentricity may take the following values: * Circular orbit: * Elliptic orbit: * Parabolic trajectory: * Hyperbolic trajectory: The eccentricity is given by e = \sqrt where ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar Gateway
The Lunar Gateway, or simply Gateway, is a planned space station which is to be assembled in orbit around the Moon. The Gateway is intended to serve as a communication hub, science laboratory, and habitation module for astronauts as part of the Artemis program. It is a multinational collaborative project: participants include NASA, the European Space Agency (ESA), the Japan Aerospace Exploration Agency (JAXA), the Canadian Space Agency (CSA), and the Mohammed Bin Rashid Space Centre (MBRSC). The Gateway is planned to be the first space station beyond low Earth orbit. However, the Second presidency of Donald Trump, Trump administration has called for ending the Gateway program in its 2026 budget proposal. The science disciplines to be studied on the Gateway are expected to include planetary science, astrophysics, Earth observation, heliophysics, Astrobiology, fundamental space biology, and Health, human health and performance. As of April 2024, construction is underway o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
