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National Aeronautics and Space Administration (view source)
Revision as of 15:28, June 2, 2008
, 15:28, June 2, 2008no edit summary
==NASA Unmanned Missions==
==NASA Unmanned Missions==
*Explorer 1 was the first satellite launched by the United States when it was sent into space on January 31, 1958. Following the launch of the Soviet Union's Sputnik 1 on October 4, 1957, the U.S. Army Ballistic Missile Agency was directed to launch a satellite using its Jupiter C rocket developed under the direction of Dr. Wernher von Braun. The Jet Propulsion Laboratory received the assignment to design, build and operate the artificial satellite that would serve as the rocket's payload. JPL completed this job in less than three months.
*'''Explorer 1''' was the first satellite launched by the United States when it was sent into space on January 31, 1958. Following the launch of the Soviet Union's Sputnik 1 on October 4, 1957, the U.S. Army Ballistic Missile Agency was directed to launch a satellite using its Jupiter C rocket developed under the direction of Dr. Wernher von Braun. The Jet Propulsion Laboratory received the assignment to design, build and operate the artificial satellite that would serve as the rocket's payload. JPL completed this job in less than three months.
:The primary science instrument on Explorer 1 was a cosmic ray detector designed to measure the radiation environment in Earth orbit. Once in space this experiment, provided by Dr. James Van Allen of the University of Iowa, revealed a much lower cosmic ray count than expected. The existence of these radiation belts was confirmed by another U.S. satellite launched two months later, and they became known as the Van Allen Belts in honor of their discoverer. <ref> http://www.nasa.gov/mission_pages/explorer/explorer-overview.html </ref>
:The primary science instrument on Explorer 1 was a cosmic ray detector designed to measure the radiation environment in Earth orbit. Once in space this experiment, provided by Dr. James Van Allen of the University of Iowa, revealed a much lower cosmic ray count than expected. The existence of these radiation belts was confirmed by another U.S. satellite launched two months later, and they became known as the Van Allen Belts in honor of their discoverer. <ref> http://www.nasa.gov/mission_pages/explorer/explorer-overview.html </ref>
*The '''Pioneer Venus''' Project's main objective was to investigate the solar wind in the Venusian environment, map the planet's surface through a radar imaging system and study the characteristics of the upper atmosphere and ionosphere.
:Pioneer Venus consisted of two spacecraft: the Orbiter and the Multiprobe. The Orbiter carried an assortment of instruments for investigating plasma in upper Venusian atmosphere, observing reflected sunlight from the cloud layers at a variety of wavelengths, in addition to a surface radar mapper, and was launched on the May 20, 1978. It reached orbit around Venus on Dec. 4, 1978. Although originally intended to operate for one Venusian year, most of the Orbiter's instruments were still operating when the spacecraft entered the atmosphere on Oct. 8, 1992.
:The Pioneer Venus Multiprobe, which was launched on Aug. 8, 1978 and reached Venus on Dec. 9, 1978, was made of 5 separate probes: the probe transporter (referred to as the Bus), a large atmospheric entry probe (called Sounder), and three small probes. The Sounder released from the Bus on Nov. 15, 1978. The three smaller probes released on Nov. 19, 1978. The probes sent data to Earth as they descended toward the surface. <ref> http://www.nasa.gov/mission_pages/pioneer-venus/index.html </ref>