active field period
21Earth's magnetic field — Computer simulation of the Earth s field in a normal period between reversals.[1] The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and… …
22Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… …
23Mercury's magnetic field — Magnetosphere of Mercury Graph showing relative strength of Mercury s magnetic field. Discovery[1] …
24Oregon Ducks track and field — University of Oregon Track and Field University …
25Sanderson Field — Infobox Airport name = Sanderson Field IATA = SHN ICAO = KSHN FAA = SHN type = Public owner = Port of Shelton operator = city served = Shelton, Washington location = elevation f = 273 elevation m = 83 coordinates =… …
26RAF Andrews Field — Infobox Military Structure name= Royal Air Force Station Andrews Field Royal Air Force Station Great Saling USAAF Station 485 location= Located Near Braintree, Essex, England coordinates=coord|51|53|53|N|000|27|18|E| caption= Andrews Field… …
27McKittrick Oil Field — The McKittrick Oil Field in Kern County, California. Other oil fields are shown in gray. The McKittrick Oil Field is a large oil and gas field in western Kern County, California. The town of McKittrick overlies the northeastern portion of the oil …
28South Cuyama Oil Field — The South Cuyama Oil Field is a large oil and gas field in the Cuyama Valley and the adjacent northern foothills of the Sierra Madre Mountains in northeastern Santa Barbara County, California. Discovered in 1949, and with a cumulative production… …
29Magnetic field of celestial bodies — See also Earth s magnetic field The magnetic field of a rotating body of conductive gas or liquid develops self amplifying electric currents, and thus a self generated magnetic field, due to a combination of differential rotation (different… …
30Wide-field Infrared Survey Explorer — (WISE) WISE prior to its mission into orbit …
