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NASASpaceflight, often referred to as NSF, is a private aerospace news organization, which operates a YouTube channel, website, and forum, which launched in 2005, as well as various social media channels covering crewed and uncrewed spaceflight and aerospace engineering news.
In Hermann–Mauguin notation, space groups are named by a symbol combining the point group identifier with the uppercase letters describing the lattice type. Translations within the lattice in the form of screw axes and glide planes are also noted, giving a complete crystallographic space group. These are the Bravais lattices in three dimensions:
The 21st Operations Group was reactivated under Air Force Space Command's 21st Space Wing in 1992 and provided missile warning, space surveillance, and space control forces. On 24 July 2020, it was redesignated as Space Delta 2 and transferred from the Air Force to the Space Force on 21 October 2020. [ 1 ]
SBD 1 was formerly known as the Peterson-Schriever Garrison (P-S GAR) until its redesignation to Space Base Delta 1 on May 23, 2022. [6] P-S GAR was activated on 24 July 2020, replacing the 21st Space Wing (based at the then Peterson Air Force Base) and the 50th Space Wing (based at the then Schriever Air Force Base).
A space group is called symmorphic (or split) if there is a point such that all symmetries are the product of a symmetry fixing this point and a translation. Equivalently, a space group is symmorphic if it is a semidirect product of its point group with its translation subgroup. There are 73 symmorphic space groups, with exactly one in each ...
The 21st Space Operations Squadron was activated on 1 October 1991, and within one year, absorbed the roles of the 2nd Satellite Tracking Group and the 1999th Communications Squadron. After the 1995 Base Realignment and Closure committee directed realignment of Onizuka AFS, 21 SOPS absorbed the roles of the 750th Space Group and all subordinate ...
This group of seven astronauts, also sometimes known as the "Original Seven" or the "Mercury Seven" were a part of the first human spaceflight program, called Project Mercury. [5] Since the original group, the total number of astronaut groups has grown to 22 as of 2017. [6] The Group 21 class joined 47 other active NASA astronauts.
Clint Basinger (born December 20, 1986), [2] better known as LGR (originally an initialism of Lazy Game Reviews), is an American YouTuber who focuses on video game reviews, retrocomputing, and unboxing videos. His YouTube channel of the same name has been compared to Techmoan and The 8-Bit Guy.