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Outer space (or simply space) is the expanse that exists beyond Earth's atmosphere and between celestial bodies. [1] It contains ultra-low levels of particle ...
The space probes WMAP, launched in 2001, and Planck, launched in 2009, ... Since the universe must be at least as old as the oldest things in it, ...
First space walk/extra-vehicular activity (Alexei Leonov). USSR Voskhod 2: March 1965: First crewed spacecraft to change orbit. USA (NASA) Gemini 3: 14 July 1965: First flyby of Mars (returned pictures). USA (NASA) Mariner 4 [18] 14 July 1965: First photographs of another planet from deep space . USA (NASA) Mariner 4 [18] 26 November 1965
An illustration depicts NASA's Voyager 1 spacecraft traveling through interstellar space, or the space between stars, which it entered in 2012.
Space exploration is the use of astronomy and space technology to explore outer space. [1] ... ("East 1"), carrying the 27-year-old Russian cosmonaut, Yuri Gagarin ...
c. 10 −36 seconds: Electroweak epoch begins: The Universe cools down to 10 28 kelvin. The strong nuclear force becomes distinct from the electroweak force.; c. 10 −33 seconds: Space is subjected to inflation, expanding by a factor of the order of 10 26 over a time of the order of 10 −33 to 10 −32 seconds.
The first space rendezvous was accomplished by Gemini 6A and Gemini 7 in 1965.. Records and firsts in spaceflight are broadly divided into crewed and uncrewed categories. Records involving animal spaceflight have also been noted in earlier experimental flights, typically to establish the feasibility of sending humans to outer space.
The index k is defined so that it can take only one of three values: 0, corresponding to flat Euclidean geometry; 1, corresponding to a space of positive curvature; or −1, corresponding to a space of positive or negative curvature. [153] The value of R as a function of time t depends upon k and the cosmological constant Λ. [151]