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Return of a spacecraft under gravity
In orbital mechanics, a free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth) where gravity
Free-return_trajectory
Type of free-return trajectory
orbital mechanics, a circumlunar trajectory, trans-lunar trajectory or lunar free return is a type of free return trajectory which takes a spacecraft from
Circumlunar_trajectory
Propulsive maneuver used to arrive at the Moon
possible to design a TLI to target a free return trajectory, so that the spacecraft will loop around behind the Moon and return to Earth without need for further
Trans-lunar_injection
Proposed spacecraft in a closed transfer orbit between two celestial bodies
encounters two or more bodies regularly by employing a free-return trajectory. This trajectory was analysed by Arthur Schwaniger in 1963 with a symmetrical
Cycler
2026 crewed flyby of the Moon
the first crewed lunar flight of the Apollo program, while its free-return trajectory resembled that flown by Apollo 13 in 1970. Among the four crew members
Artemis_II
Arrival of a spacecraft on the Moon's surface
will loop around the Moon and return to Earth without entering lunar orbit, following the so-called free return trajectory. Such circumlunar loop missions
Moon_landing
Aborted Moon landing mission in the Apollo program
would miss Earth on its return trajectory, rather than intercept it, as with a free return. A free return trajectory could only reach sites near the
Apollo_13
Future plans to make the Moon available for tourism
individuals had been received by SpaceX for a Moon loop flight using a free return trajectory and that this could happen as soon as late 2018. Musk said that
Tourism_on_the_Moon
Space flight maneuver
spacecraft on a trajectory which will intersect the Earth's sphere of influence, usually putting the spacecraft on a free return trajectory. The maneuver
Trans-Earth_injection
NASA-led lunar exploration program
high Earth orbit before Orion was boosted into a free-return trajectory around the Moon, returning to Earth for re-entry and splashdown. The mission
Artemis_program
Human space travel for recreation
planning on sending space tourists, including Yusaku Maezawa, on a free-return trajectory around the Moon on the Starship, however the project was cancelled
Space_tourism
American astronaut (1928–2025)
Lovell and his crew re-established the free return trajectory that they had left, and swung around the Moon to return home. Based on the flight controllers'
Jim_Lovell
Second crewed Moon landing
hybrid, non-free-return trajectory. Previous crewed missions to lunar orbit had taken a free-return trajectory, allowing an easy return to Earth if the
Apollo_12
Chinese lunar probe (2014–2020)
the first sample-return mission of the Chinese Lunar Exploration Program. Launched by a Long March 3C on a free-return trajectory around the Moon, the
Chang'e_5-T1
Photograph of Earth by Reid Wiseman
completion of the trans-lunar injection burn that placed Orion on a free-return trajectory toward the Moon. Wiseman captured the image through a spacecraft
Hello,_World_(photograph)
Topics referred to by the same term
technology, also known as deep water culture, in hydroponic farming Free return trajectory of a spacecraft Front (Frt), in linguistics; see List of glossing
FRT
Spacecraft launch or descent maneuver
of this maneuver, the free-return trajectory allows the spacecraft to depart from a planet, circle another planet once, and return to the starting planet
Gravity_turn
Small rocket engines that help fuel settle in 0g before main engine start
course-correction burn of the LEM's main descent engine to re-enter a free return trajectory to Earth during the successful recovery of the Apollo 13 capsule:
Ullage_motor
Design feature or practice
example: Spacecraft trajectory - During early Apollo program missions to the Moon, the spacecraft was put on a free return trajectory — if the engines had
Fail-safe
Type of orbit which passes close to the Earth and Moon
provide for both routine and emergency return on a fairly regular basis. Spaceflight portal Free-return trajectory – Return of a spacecraft under gravity Interstellar
Lunar_cycler
Cancelled crewed circumlunar mission and art project
announced that they were planning to fly two space tourists on a free-return trajectory around the Moon, now known to be billionaire Yusaku Maezawa, and
DearMoon_project
Primary power and propulsion component of the Orion spacecraft
000 pounds (450 kg) of propellant and placed the spacecraft on a free-return trajectory around the Moon, requiring only minor course corrections for the
European_Service_Module
Apollo 13 looped around the Moon 158 miles above the surface on a free-return trajectory. All nine crewed Apollo missions to the Moon's vicinity took place
List_of_Apollo_astronauts
US deep space exploration programs
technology-demonstration spacecraft designed to test a low-energy trans-lunar trajectories and to demonstrate the near-rectilinear halo orbit (NRHO) intended to
List_of_Artemis_missions
1995 film by Ron Howard
including the mid-course correction that sent the mission on a "free return" trajectory around the Moon and back to the Earth. The astronaut Ken Mattingly
Apollo_13_(film)
Orbit of an object around the Moon
circumlunar free return trajectory, still not a lunar orbit, but a figure-8 trajectory which swung around the far side of the Moon and returned to Earth
Lunar_orbit
Location on the Moon; landing site for the Apollo 14 mission
regions in order to enable the Moon-bound spacecraft to remain on a free-return trajectory should the Apollo Service Module engine fail. After Apollo 12 demonstrated
Fra_Mauro_formation
its furthest from Earth during the mission. Apollo 13's unique free return trajectory caused it to go approximately 100 kilometers (60 mi) further from
Timeline_of_space_exploration
the Moon for gravity assist manoeuvres to alter their interplanetary trajectories. In addition, Explorer 49, a radio astronomy satellite launched by the
List_of_missions_to_the_Moon
American industrial company
lunar missions. This engine was then used on Apollo 13 to achieve free return trajectory and make a minor course correction after damage to the Service Module
TRW_Inc.
Series of Soviet robotic space probes launched between 1964 and 1970
Proton rocket which was just powerful enough to send the Zond on a free return trajectory around the Moon without going into lunar orbit (the same kind of
Zond_program
2005 British TV series or programme
they will fly on, forever lost in space". In fact, Apollo 8 used a free return trajectory that would have taken them back to Earth had the engine performing
Space_Race_(TV_series)
Type of spacecraft orbit
a lunar DRO approximately 40,000 km (25,000 mi) above the Moon. Free-return trajectory Johnson, Kirstyn (18 December 2014). "Understanding NASA's Asteroid
Distant_retrograde_orbit
Spacecraft trajectory that encounters Earth and Mars regularly
cycler (or Earth–Mars cycler) is a kind of cycler, a spacecraft with a trajectory that encounters Earth and Mars regularly. The Aldrin cycler is an example
Mars_cycler
Uncrewed spaceflight program by NASA
airplane. SCIM was a sample return mission that would have used a free-return trajectory and aerogel to capture Mars dust and return it to Earth (see also:
Mars_Exploration_Program
Artemis program crewed spacecraft
flight was Artemis I, the first major milestone in NASA's Artemis program to return humans to the Moon, on November 16, 2022. The Space Launch System launched
Orion_(spacecraft)
Extreme benchmarks set off Earth by astronauts, launchers and probes
(1,200 mi) of the Moon and then successfully returned to Earth, the first spacecraft in history to return safely to Earth from the Moon. Spaceflight portal
List_of_spaceflight_records
Concept for a Mars air and dust sample return
Earth on a free-return trajectory. The success of fellow Discovery program mission Stardust was noted as supporting future sample return missions, and
Sample Collection for Investigation of Mars
Sample_Collection_for_Investigation_of_Mars
Final Soviet sample-return mission to the Moon, 1976
sample return cabin was 50 cm in diameter and had a mass of 39 kg. The KRD-61 could only fire once, for 53 seconds, to put it on a free return trajectory to
Luna_24
Spaceflight not by a government
mission would have taken advantage of an infrequently occurring free return trajectory—a unique orbit opportunity which occurs only once every fifteen
Private_spaceflight
Russian rocket engine
and the RD-0212 module launched the Zond 5 around the Moon on a free return trajectory, that sent the first alive organisms around the moon and back to
RD-0210
Moon, after flying to within 6,200 km of the lunar surface on a free return trajectory to salvage it from an unusable orbit. 4 April 2000 – Soyuz TM-30
Timeline of private spaceflight
Timeline_of_private_spaceflight
Science of the motion of projectiles
during the relatively brief initial phase of powered flight, with the trajectory subsequently governed by the laws of classical mechanics, in contrast
Ballistics
PanAmSat communications satellite
this trajectory concept unworkable. Instead, Hughes used an Apollo-style free-return trajectory that required only a few days to complete, a trajectory designed
PAS-22
Defunct, proposed a crewed flyby mission
They proposed a free return trajectory to allow the spacecraft to use the smallest possible amount of propellant to flyby Mars and return to Earth. They
Inspiration_Mars_Foundation
Proposed rocket stage in Saturn C vehicle
the S-I plus S-III plus S-IV stages plus, for some missions, S-V. Free return trajectory simulation, Robert A. Braeunig, August 2008 Bilstein, Roger E. (1980)
S-III
1961–1972 American crewed lunar exploration program
and Apollo 11) used a free return trajectory, keeping a flight path coplanar with the lunar orbit, which would allow a return to Earth in case the SM
Apollo_program
Proposed American orbital launcher
April 1968, 5th ed., MHR-5 (Huntsville, AL : MSFC, 20 Jan. 1971). Free return trajectory simulation, Robert A. Braeunig, August 2008 Encyclopedia Astronautica
Saturn_C-2
"Failure Review Oversight Board (FROB) Concludes Express AM4R Investigation; Return to Flight Mission Success on September 28". International Launch Services
2014_in_spaceflight
Neurophilosophical study of topics related to free will
The neuroscience of free will is an area within neurophilosophy and is the study of topics related to free will (including volition and the sense of agency)
Neuroscience_of_free_will
Rocket vernier engine
1968, the RD-0214 module launched the Zond 5 around the Moon on a free return trajectory, that sent the first alive organisms around the moon and back to
RD-0214
Short story by Isaac Asimov
later, Harman launches the New Prometheus and succeeds in making a free return trajectory around the Moon. Harman lands across the Potomac from Washington
Trends_(short_story)
Proposed Mars sample return mission
return phase. When the orbiter is three days away from Earth, the EES will be released from the main spacecraft, and fly a precision entry trajectory
NASA-ESA_Mars_Sample_Return
Absence of government restriction on international trade
Free trade is a trade policy that does not restrict imports or exports through legal barriers. In government, free trade is predominantly advocated by
Free_trade
concept encompassing dynamical systems which return to a trajectory, as opposed to systems which return to a particular state, which is termed homeostasis
Homeorhesis
Sharp. Trajectory maintains her place on Infinity Inc. with Natasha Irons's help until Lex Luthor disables her powers, leading to Trajectory being killed
List of DC Comics characters: T
List_of_DC_Comics_characters:_T
lunar surface, and Luna 16, which achieved the first uncrewed lunar sample return. The Soviets also continued the success of the Venera Venus probes with
1970_in_spaceflight
Jamaican scholar and polymath (c. 1690 – c. 1770)
he officially became a British subject. After returning to Jamaica, he established a free school for free people of colour in Jamaica. His portrait is
Francis_Williams_(polymath)
Apparent force in a rotating reference frame
to bear to the left from direction of travel on both inward and return trajectories. The curved path demands this observer to recognize a leftward net
Coriolis_force
1985 American crewed spaceflight
[failed verification] The failed RS-25 resulted in an Abort to Orbit (ATO) trajectory, whereby the shuttle achieved a lower-than-planned orbital altitude. The
STS-51-F
Path of an object through spacetime
distinguished from concepts such as an "orbit" or a "trajectory" (e.g., a planet's orbit in space or the trajectory of a car on a road) by inclusion of the dimension
World_line
Sports car launched into space in 2018
car, mounted on the rocket's second stage, was launched on an escape trajectory and entered an elliptical heliocentric orbit crossing the orbit of Mars
Elon_Musk's_Tesla_Roadster
Earth-Mars-Venus-Earth route
Crocco's Multiplanetary Trajectory, sometimes named Crocco's Mission and Crocco's "Grand Tour", is a mathematical description of an hypothetical
Crocco's Multiplanetary Trajectory
Crocco's_Multiplanetary_Trajectory
Speed at which a body orbits around the barycenter of a system
open orbits do not return; once past periapsis their distance from the focus increases without bound. See radial hyperbolic trajectory If the total energy
Orbital_speed
Passage of an object through the gases of an atmosphere from outer space
vehicle is entering an atmosphere at very high speed (hyperbolic trajectory, lunar return) and has a large nose radius then radiative heat flux can dominate
Atmospheric_entry
Glide and reentry methods to use aerodynamic lift in the upper atmosphere
or skip-glide, is a class of atmospheric entry trajectories that follow a non-ballistic trajectory by employing aerodynamic lift in the high upper atmosphere
Boost-glide
Concept in astrophysics
the orbit, and does not depend on the eccentricity). A purely radial trajectory is an example of a degenerate ellipse with an eccentricity of 1 and semi-major
Free-fall_time
Wayback Machine at NASA NSSDC Master Catalog "NASA – NSSD – Spacecraft – Trajectory Details (SAS-B)". NASA. Archived from the original on 2016-11-29. Retrieved
List_of_space_telescopes
Spaceflight where spacecraft orbits an astronomical body
placed on a trajectory where it could remain in space for at least one orbit. To do this around the Earth, it must be on a free trajectory which has an
Orbital_spaceflight
Racket sport
is characterized by an emphasis on spin, which can affect the ball's trajectory more than in other ball sports. Owed to its small minimum playing area
Table_tennis
2020 Russian film
mission will require teamwork, making them friends again. The spaceship's trajectory veers to planet Earth. Meanwhile, their best friend, rat Lenny is looking
Space_Dogs:_Return_to_Earth
First crewed Moon landing (1969)
the Apollo spacecraft with a free-return trajectory, one that would allow it to coast around the Moon and safely return to Earth without requiring any
Apollo_11
Curved path of an object around a point
In celestial mechanics, an orbit is the curved trajectory of an object under the influence of an attracting force. Alternatively, it is known as an orbital
Orbit
American mathematician (1918–2020)
NASA scientist". Johnson's work included calculating trajectories, launch windows, and emergency return paths for Project Mercury spaceflights, including
Katherine_Johnson
Type of shot in racket sports
pace (the ball's behavior after it bounces on the opponent's side), trajectory and angle. If a "good groundstroke" is to be played, it would generally
Groundstroke
Field of classical mechanics concerned with the motion of spacecraft
planets, moons, and comets. Orbital mechanics focuses on spacecraft trajectories, including orbital maneuvers, orbital plane changes, and interplanetary
Orbital_mechanics
Genocide of European Jews by Nazi Germany
ISBN 978-3-319-97999-1. S2CID 151138604. Smith, Stephen D. (2023). The Trajectory of Holocaust Memory: The Crisis of Testimony in Theory and Practice. Taylor
The_Holocaust
American football player (born 1986)
career trajectory". Chicago Sun-Times. Retrieved March 14, 2018. Mayer, Larry (March 14, 2018). "Roster Moves: Bears land five unrestricted free agents"
Chase_Daniel
Crash of US Air Force bomber with nuclear warheads
had been lost in three minutes. The aircraft was immediately directed to return and land at Seymour Johnson Air Force Base. As the aircraft descended through
1961_Goldsboro_B-52_crash
NASA space probe launched in 1977
August 20, 1977, as a part of the Voyager program. It was launched on a trajectory towards the gas giants (Jupiter and Saturn) and enabled further encounters
Voyager_2
American domestic terrorist (1942–2023)
Agostino, eds. (2009). A New Understanding of Terrorism: Case Studies, Trajectories and Lessons Learned. New York City: Springer. ISBN 978-1-4419-0115-6
Ted_Kaczynski
Space navigation technique
A slingshot maneuver can therefore be used to change the spaceship's trajectory and speed relative to the Sun. A close terrestrial analogy is provided
Gravity_assist
Philosophical view which prioritises the long-term future
civilisation's trajectory to make it better while it lasts. Broadly, ensuring survival increases the quantity of future life; trajectory changes increase
Longtermism
Team sport played on ice
of eight or ten ends. The player throwing the stone creates a curved trajectory, known as "curl", by gently rotating the stone as they release it. The
Curling
American football player (born 1999)
closest to Zach Wilson – Ute fans to the core – influenced his football trajectory and played a hand in landing him at BYU". Deseret News. Retrieved September
Zach_Wilson
President of Egypt from 1970 to 1981
Nasser's death in 1970. In his 11 years as president, he changed Egypt's trajectory, departing from many political and economic tenets of Nasserism, reinstituting
Anwar_Sadat
Compact astronomical body
escape from the photon sphere, any light that crosses it on an inward trajectory is inevitably captured by the black hole. Consequently, any light reaching
Black_hole
NASA sample return probe
releasing the sample return capsule on September 8, 2004, the spacecraft bus traveled back toward the Earth-Sun Lagrange Point (L1). A trajectory correction maneuver
Genesis_(spacecraft)
Form of extrajudicial killing
people and corpses loaded onto aircraft; after taking off, the planes returned empty. On 12 March 2016, Interpol, through the National Police of Colombia
Death_flights
French biopic film
unusually slow start followed by a sustained increase in attendance, a trajectory widely attributed to strong word of mouth. L'Âge de fer sold approximately
De_Gaulle_(2026_film)
Kick downfield to the opposing team in gridiron football
direction, trajectory, and landing behavior. The rugby-style punt is often used to produce directional kicks toward the sideline, reduce return opportunities
Punt_(gridiron_football)
US Nuclear bomb
Mod 6 was to get a new MC4137 Trajectory Sensing Signal Generator. The MC4175 stored the arming signal for the trajectory stronglink in its memory, so
B61_nuclear_bomb
Bangladeshi diplomat and President of the UN General Assembly
Gor, saying that relations between the two countries were on a positive trajectory and that Bangladesh sought continued American support on the Rohingya
Khalilur_Rahman
Political demonstrations in Gaza
The 2018–2019 Gaza border protests, also known as the Great March of Return (Arabic: مسیرة العودة الكبرى, romanized: Masīra al-ʿawda al-kubrā), were a
2018–2019 Gaza border protests
2018–2019_Gaza_border_protests
Quantum mechanical effect in disordered media
mechanical phenomenon whereby wavepackets launched through disordered media return, on average, to their starting points, as a consequence of Anderson localization
Quantum_boomerang_effect
Marketing promotion by Hoover Company
vacuum cleaner) failed to stimulate interest, to correct its financial trajectory, Hoover's executives decided to create an exciting marketing promotion
Hoover_free_flights_promotion
the passengers by manually activating the satellite's engines. 3 "Return Trajectory" Transliteration: "Kikan Kidō" (Japanese: 帰還軌道) Megumi Yamamoto October 18
List_of_Planetes_episodes
British politician (1932–2023)
government's economic policy, though the extent to which the subsequent trajectory of policy and outcome matched that projected is still a matter for debate
Nigel_Lawson
2019 video game
they board a transport plane that flies across the map in a randomized trajectory. This flight path changes every game. Every team is automatically given
Call_of_Duty:_Mobile
British businessman (born 1978)
"Fan fave Buglioni desperate to stand and fight, will continue career trajectory on Saturday". HITC. Retrieved 25 July 2020. Saunders, Nate (3 March 2020)
William_John_Storey
travel, tourism, insurance
FREE RETURN-TRAJECTORY
FREE RETURN-TRAJECTORY
Girl/Female
Hebrew
Incense.
Surname or Lastname
English
English : variant of Freer 1.French (Frère) : from frère ‘brother’, used as a byname for the younger of two brothers.
Surname or Lastname
English
English : from Old French and Middle English frere ‘friar’ (Latin frater, literally ‘brother’). This was a status name for a member a religious order, especially a mendicant order, and may also have been a nickname for a pious person or for someone employed at a monastery.Americanized spelling of French Frère (see Frere).North German and Dutch : cognate of Friedrich.
Surname or Lastname
English
English : nickname from Middle English freil, frel(i)e ‘frail’, ‘weak’.Possibly an Americanized spelling of German Friel 2.
Male
Swedish
Danish and Swedish form of Old Norse Freyr, FREJ means "lord, master."
Surname or Lastname
English (mainly southeastern)
English (mainly southeastern) : topographic name for someone who lived near a conspicuous tree, Middle English tre(w).
Surname or Lastname
English (chiefly East Anglia)
English (chiefly East Anglia) : nickname or status name from Old English frēo ‘free(-born)’, i.e. not a serf.North German : topographic or habitational name from a place named Frede or Frede(n).North German : nickname from a variant of Middle Low German wrēd ‘crooked’.
Girl/Female
Christian & English(British/American/Australian)
Return of Sound
Male
Icelandic
Icelandic form of Old Norse Freyr, FREY means "lord, master."
Girl/Female
Indian
Return of Love
Boy/Male
American, British, English
From the Deer's Stream
Boy/Male
Greek
Helps Odysseus return home.
Boy/Male
Australian, British, English, German
From the Roe-deer Brook
Boy/Male
British, English
A Planet
Female
English
Anglicized form of Danish Freya, FREA means "lady, mistress."
Surname or Lastname
English
English : habitational name from Redbourn in Hertfordshire or Redbourne in Humberside (formerly Lincolnshire), named with Old English hrēod ‘reeds’ + burna ‘stream’.
Boy/Male
Australian, British, English
In Liberty
Female
English
English form of Irish BrÃgh, BREE means "force, strength."
Surname or Lastname
English
English : variant spelling of Fry.North German : variant of Frey.Joseph Frye (1711/12–94) was a military officer from Andover, MA, where the family had long been of local prominence. In 1762, he was granted a township in ME, later named Fryeburg after him, and moved his family there. His great-great-grandson William Pierce Frye was born in Lewiston, ME, and served in Congress, first as a member of the House of Representatives and then the Senate from 1871 until his death in 1911.
Male
English
Short form of English Frederick, FRED means "peaceful ruler."
FREE RETURN-TRAJECTORY
FREE RETURN-TRAJECTORY
FREE RETURN-TRAJECTORY
FREE RETURN-TRAJECTORY
FREE RETURN-TRAJECTORY
FREE RETURN-TRAJECTORY
FREE RETURN-TRAJECTORY
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