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A Explorer program was a United States's first successful attempt to launch an artificial satellite . It began as a U.S. Army proposal to place a scientific satellite into orbit during the International Geophysical Year. That proposal was rejected pro the U.S. Navy's Project Vanguard. It was revived as a crash program to catch up by having a Soviet Union after that nation's launch of Sputnik I on October 4, 1957. (View: Sputnik crisis) Explorer 1 was launched January 31 1958. Besides existence a foremost U.S. satellite, these are known for discovering a Van Allen radiation belt.

Explorer at NASA
A Explorer program was taken across by NASA, which continued to use a title for unmanned space missions. Above a years, NASA has launched a series of "Explorer" spacecraft carrying a wide kind of scientific investigations. A listing following identifies a 79 successful missions when of December 2004. When of this writing, Explorers 50 (IMP-8), 68-71, 73-74 & 77-83 (SAMPEX, RXTE, Convenient, ACE, TRACE, SWAS, FUSE, IMAGE, WMAP, RHESSI, CHIPSat, GALEX & SWIFT) come however in operation.

NASA's Explorer space vehicle series non merely is the hanker heading series of ballistic capsule, it has produced extremely-durable, easily-engineered ballistic capsule too. Of a 79 successful Explorer missions depicted, fully 5 of a children got got missions which lasted Tenner or even sir thomas more years, the longest of which (IMP-8) has been operational for complete Twenty-six years currently & however produces worthful tools just about the solar wind. NASA's IUE spacecraft operated for 19 years & produced copious numbers of information for the astronomic community. A ISEE 3/ICE ballistic capsule operated for Xiv years. When of March of 2000, of the 10 operational Explorer missions, SNOE & TRACE st& operated for astir ii years, ACE deuce & the half years, Convenient for astir ternary & a half, RXTE for all over quatern, EUVE and SAMPEX for about eight, and IMP 8 for other than Xxvi. SWAS has been operational for slightly supplementary than of these season, with been launched within early December 1998.

Mission History

de:Explorer (Raumsonde) fr:Programme Explorer

Explorers Program
Goddard Space Flight Center provides frequent flight opportunities for world-class scientific investigations from space. Includes program history, current missions, and upcoming opportunity schedule.

NASA's Explorer Missions
The National Space Science Data Center (NSSDC) provides a summary list of all Explorer missions with links to mission overviews and data.

Small Explorer (SMEX) Program
Includes information about the small explorer class of missions in the explorers program, including SAMPEX, FAST, SWAS, TRACE, and WIRE.
Science: Technology: Space: NASA: Missions






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