extra-solar-system flight
61Human spaceflight — Orbital Human spaceflight Name Debut Launches Vostok 1961 6 Mercury 1962 4 Voskhod 1964 2 Gemini 1965 …
62Orbital mechanics — A satellite orbiting the earth has a tangential velocity and an inward acceleration. Orbital mechanics or astrodynamics is the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other… …
63Colonization of the Moon — Lunar outpost redirects here. For NASA s plan to construct an outpost between 2012 and 2024, see Lunar outpost (NASA). Moonbase redirects here. For other uses, see Moonbase (disambiguation). 1986 artist concept The colonization of the Moon is the …
64spaceflight — /spays fluyt /, n. the flying of manned or unmanned spacecraft into or in outer space. Also, space flight. [1945 50; SPACE + FLIGHT1] * * * Introduction flight beyond Earth s atmosphere. This article deals with the basic concepts associated with …
65Private spaceflight — This article is about non governmental spaceflight. For paying space tourists, see Space tourism. For general commercial use of space, see Commercialization of space. Astronaut Dale A. Gardner holding a For Sale sign Private spaceflight is flight …
66Time dilation — This article is about a concept in physics. For the concept in sociology, see time displacement. In the theory of relativity, time dilation is an observed difference of elapsed time between two events as measured by observers either moving… …
67telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …
68Nibiru collision — This article is about the doomsday scenario. For other uses, see Nibiru. V838 Mon, a star with an expanding light echo, purported as photographic evidence of Nibiru The Nibiru collision is a supposed disastrous encounter between the Earth and a… …
69History of video games — Part of a series on …
70Coordinated Universal Time — UTC redirects here. For other uses, see UTC (disambiguation). Coordinated Universal Time (abbreviated UTC) is the primary time standard by which the world regulates clocks and time. It is one of several closely related successors to Greenwich… …
