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ammonium nitrate
(Encyclopedia) ammonium nitrate, chemical compound, NH4NO3, that exists as colorless, rhombohedral crystals at room temperature but changes to monoclinic crystals when heated above 32℃. It is…Blagoveshchensk
(Encyclopedia) Blagoveshchensk Blagoveshchensk bləgəvyĕshˈchĭnsk [key], city, capital of Amur region, Russian Far East…Thiruvananthapuram
(Encyclopedia) ThiruvananthapuramThiruvananthapuramtĭrˌ&oomacr;vənŭnˌtəp&oobreve;rˈəm [key], formerly TrivandrumThiruvananthapuramtrĭvănˈdrəm [key], city (1991 pop. 826,255), capital and…winter cress
(Encyclopedia) winter cress or upland cress, species of Barbarea, herbs of the family Cruciferae (or Brassicaceae; mustard family). The pungent leaves of several species have been used for salads or…Space Force, United States
(Encyclopedia) Space Force, United States (USSF), military force that forms a separate service within the U.S. Dept. of the Air Force, est. Dec. 20, 2019, by act of Congress. The head of the Space…radiosonde
(Encyclopedia) radiosonderadiosonderāˈdēōsŏnd [key], group of instruments for simultaneous measurement and radio transmission of meteorological data, including temperature, pressure, and humidity of…Robert Hutchings Goddard
Robert Hutchings Goddard Born: 1882Birthplace: Worcester, Mass. Control mechanism for rocket apparatus—Goddard launched the first liquid-fuel rocket in 1926. Other rocket design developments…flight
(Encyclopedia) CE5 Aircraft motions and control surfaces: Yaw, or motion to the left or right, is controlled by the rudder. Pitch, or climbing or dropping, is controlled by the elevators, which…Stephenson, George
(Encyclopedia) Stephenson, George, 1781–1848, British engineer, noted as a locomotive builder. He learned to read and write in night school at the age of 18, while working in a colliery. He…Armstrong, Neil Alden
(Encyclopedia) Armstrong, Neil Alden, 1930–2012, American astronaut, b. Wapakoneta, Ohio, grad. Purdue Univ. (B.S., 1955), Univ. of Southern California (M.S., 1970). A U.S. Navy fighter pilot during…Trending
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