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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:
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 ...
Mission Delta 2 (MD2) is the United States Space Force's space domain awareness delta, headquartered at Peterson Space Force Base, Colorado.Mission Delta 2 tracks and monitors all human made objects from low Earth orbit to geosynchronous orbit and further out to deep space.
The 21st Space Operations Squadron supports DOD-assigned space missions by operating, maintaining and providing logistical support for the common user resources of the SCN. The 21 SOPS Network Operations Center is the prime SCN fault detection and isolation resource for the primary and additional operational switch replacement communication links.
The Group performed space surveillance. In April 1995 the 73d Space Surveillance Group merged with the 21st Space Wing. From that point the 21st became the largest wing in the United States Air Force with units deployed throughout the world. In December 2021, DEL 3 was awarded as the best delta in Space Operations Command. [17]
The Space Task Group was a working group of NASA engineers created in 1958, tasked with managing America's human spaceflight programs. Headed by Robert Gilruth and based at the Langley Research Center in Hampton, Virginia , it managed Project Mercury and follow-on plans.
This category lists crystals that display the symmetry of the P3 1 21 space group (No. 152) of the trigonal crystal system, or the enantiomorphic space group P3 2 21 (No. 154). The element or compound can assume either one of these two space groups. The crystal being referred to may be just one of the possible forms of a named element or compound.