Please answer the following question: Information: - A spacecraft is a vehicle, or machine designed to fly in outer space. Spacecraft are used for a variety of purposes, including communications, earth observation, meteorology, navigation, space colonization, planetary exploration, and transportation of humans and cargo. - A low Earth orbit (LEO) is an orbit around Earth with an altitude between (orbital period of about 88 minutes), and (about 127 minutes). Objects below approximately will experience very rapid orbital decay and altitude loss. - The Moon is an astronomical body that orbits planet Earth, being Earth's only permanent natural satellite. It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary). Following Jupiter's satellite Io, the Moon is second-densest satellite among those whose densities are known. - The National Space Science Data Center serves as the permanent archive for NASA space science mission data. "Space science" pertains to astronomy and astrophysics, solar and space plasma physics, and planetary and lunar science. As the permanent archive, NSSDC teams with NASA's discipline-specific space science "active archives" which provide access to data to researchers and, in some cases, to the general public. NSSDC also serves as NASA's permanent archive for space physics mission data. It provides access to several geophysical models and to data from some non-NASA mission data. - An astronaut or cosmonaut is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. Although generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space, including scientists, politicians, journalists, and tourists. - Frank Frederick Borman, II (born March 14, 1928), (Col, USAF, Ret.), is a retired United States Air Force pilot, aeronautical engineer, test pilot, and NASA astronaut, best remembered as the Commander of Apollo 8, the first mission to fly around the Moon, making him, along with crew mates Jim Lovell and Bill Anders, the first of only 24 humans to do so. Before flying on Apollo, he set a fourteen-day spaceflight endurance record on Gemini 7, and also served on the NASA review board which investigated the Apollo 1 fire. After leaving NASA, he was the Chief Executive Officer (CEO) of Eastern Air Lines from 1975 to 1986. Borman is a recipient of the Congressional Space Medal of Honor. - The John F. Kennedy Space Center (KSC) is one of ten National Aeronautics and Space Administration field centers. Since December 1968, Kennedy Space Center has been NASA's primary launch center of human spaceflight. Launch operations for the Apollo, Skylab and Space Shuttle programs were carried out from Kennedy Space Center Launch Complex 39 and managed by KSC. Located on the east coast of Florida, KSC is adjacent to Cape Canaveral Air Force Station (CCAFS). The management of the two entities work very closely together, share resources, and even own facilities on each other's property. - Apollo 8, the second manned mission in the United States Apollo space program, was launched on December 21, 1968, and became the first manned spacecraft to leave Earth orbit, reach the Earth's Moon, orbit it and return safely to Earth. The three-astronaut crewCommander Frank Borman, Command Module Pilot James Lovell, and Lunar Module Pilot William Andersbecame the first men to travel beyond low Earth orbit, the first to see Earth as a whole planet, the first to directly see the far side of the Moon, and then the first to witness Earthrise. The 1968 mission, the third flight of the SaturnV rocket and that rocket's first manned launch, was also the first manned launch from the Kennedy Space Center, Florida, located adjacent to Cape Canaveral Air Force Station. - The far side of the Moon is the hemisphere of the Moon that always faces away from Earth. The far side's terrain is rugged, with a multitude of impact craters and relatively few flat lunar maria. It has one of the largest craters in the Solar System, the South PoleAitken basin. Although both sides of the moon experience two weeks of sunlight followed by two weeks of night, the far side is also referred to as the dark side of the Moon, originally in the sense of "unknown" rather than lack of light. - Cape Canaveral Air Force Station (CCAFS) (known as Cape Kennedy Air Force Station from 1963 to 1973) is an installation of the United States Air Force Space Command's 45th Space Wing, headquartered at nearby Patrick Air Force Base. Located on Cape Canaveral in Brevard County, Florida, CCAFS is the primary launch head of America's Eastern Range with three launch pads currently active (Space Launch Complexes 37B, 40, and 41). Popularly known as "Cape Kennedy" from 1963 to 1973, and as "Cape Canaveral" from 1949 to 1963 and from 1973 to the present, the facility is south-southeast of NASA's Kennedy Space Center on adjacent Merritt Island, with the two linked by bridges and causeways. The Cape Canaveral Air Force Station Skid Strip provides a runway close to the launch complexes for military airlift aircraft delivering heavy and outsized payloads to the Cape. - Astrophysics is the branch of astronomy that employs the principles of physics and chemistry "to ascertain the nature of the heavenly bodies, rather than their positions or motions in space." Among the objects studied are the Sun, other stars, galaxies, extrasolar planets, the interstellar medium and the cosmic microwave background. Their emissions are examined across all parts of the electromagnetic spectrum, and the properties examined include luminosity, density, temperature, and chemical composition. Because astrophysics is a very broad subject, "astrophysicists" typically apply many disciplines of physics, including mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum mechanics, relativity, nuclear and particle physics, and atomic and molecular physics. - Astronomy is a natural science that studies celestial objects and phenomena. It applies mathematics, physics, and chemistry, in an effort to explain the origin of those objects and phenomena and their evolution. Objects of interest include planets, moons, stars, galaxies, and comets; while the phenomena include supernovae explosions, gamma ray bursts, and cosmic microwave background radiation. More generally, all astronomical phenomena that originate outside Earth's atmosphere are within the purview of astronomy. A related but distinct subject, physical cosmology, is concerned with the study of the Universe as a whole. - Space physics is the study of plasmas as they occur naturally in the Earth's upper atmosphere. As such, it encompasses a far-ranging number of topics, such as heliophysics which includes the solar physics of the sun: the solar wind, planetary magnetospheres and ionospheres, auroras, cosmic rays, and synchrotron radiation. Space physics is a fundamental part of the study of space weather and has important implications not only to understanding the universe, but also to practical everyday life, including the operation of communications and weather satellites. Space physics is distinct from other fields of astrophysics which study similar phenomena, in that space physics utilizes in situ measurements from high altitude rockets and spacecraft. - Earthrise is a photograph of the Earth and parts of the Moon's surface taken by astronaut William Anders in 1968, during the Apollo 8 mission. Nature photographer Galen Rowell declared it "the most influential environmental photograph ever taken." This had been preceded by the crude 1966 black-and-white raster earthrise image taken by the Lunar Orbiter 1 robotic probe. - The United States National Space Science Data Center catalogued 157 spacecraft placed into orbit by launches which occurred in 1968 . The first manned Apollo missions occurred in 1968 . It was also the year in which humans first left low Earth orbit , during the successful Apollo 8 mission . - The National Aeronautics and Space Administration (NASA ) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program as well as aeronautics and aerospace research. - William Alison "Bill" Anders (born October 17, 1933), (Maj Gen, USAFR, Ret.), is a former United States Air Force officer, electrical engineer, nuclear engineer, NASA astronaut, and businessman. Anders, along with Apollo 8 crewmates Frank Borman and Jim Lovell, is one of the first three persons to have left Earth orbit and traveled to the Moon. Given the paragraphs above, decide what entity has the relation 'facet of' with 'spaceflight'.
Answer:
1968 in spaceflight