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SPHERES aboard ISS. The Synchronized Position Hold Engage and Reorient Experimental Satellite (SPHERES) are a series of miniaturized satellites developed by MIT's Space Systems Laboratory for NASA and US Military, to be used as a low-risk, extensible test bed for the development of metrology, formation flight, rendezvous, docking and autonomy algorithms that are critical for future space ...
Frank Jeffrey Edson Smart AO ... 1979 Guiding Spheres II Archived 22 March 2012 at the Wayback ... Jeffrey Smart. Beagle Press. ISBN 0-947349-46-4. Allen, Christopher ...
An hour-long documentary, Elizabeth Smart: On the Side of the Angels (1991) by Maya Gallus starred actor Jackie Burroughs as Elizabeth Smart and was narrated by author Michael Ondaatje. The publication of her journals in On The Side of the Angels brought further posthumous critical appreciation [ 10 ] [ 11 ] [ 12 ]
Class I (b=0 or c=0): {3,q+} b,0 or {3,q+} 0,b represent a simple division with original edges being divided into b sub-edges. Class II (b=c): {3, q +} b , b are easier to see from the dual polyhedron { q ,3} with q -gonal faces first divided into triangles with a central point, and then all edges are divided into b sub-edges.
In its first and simplest form, derived by the Danish astrophysicist Bengt Strömgren in 1939, the model examines the effects of the electromagnetic radiation of a single star (or a tight cluster of similar stars) of a given surface temperature and luminosity on the surrounding interstellar medium of a given density.
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Note that the u coordinates are defined everywhere but (−1, 0, 0, 0) and the v coordinates everywhere but (1, 0, 0, 0). This defines an atlas on S 3 consisting of two coordinate charts or "patches", which together cover all of S 3. Note that the transition function between these two charts on their overlap is given by
An arrangement in which the midpoint of all the spheres lie on a single straight line is called a sausage packing, as the convex hull has a sausage-like shape.An approximate example in real life is the packing of tennis balls in a tube, though the ends must be rounded for the tube to coincide with the actual convex hull.