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Explorer

Explorer 10 satellite undergoing testing in a NASA laboratory prior to being launched in 1961.

(credit: NASA)

Any of the largest (55-member) series of unmanned U.S. spacecraft, launched between 1958 and 1975. Explorer 1, the first satellite sent into orbit by the U.S., discovered the innermost Van Allen radiation belt. Other notable craft in this series include Explorer 38 (1968), which measured galactic radio sources and studied low radio frequencies in space, and Explorer 53 (SAS 3; 1975), which investigated X-ray and gamma-ray sources within and beyond the Milky Way Galaxy.

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Explorer

The user interface in Windows starting with Windows 95. It includes the Start menu, Taskbar, desktop and file manager. For most users, the term refers only to the Explorer file manager, which is used to copy, rename and delete files and folders. The same file manager functionality in Explorer is also available from within Internet Explorer, Microsoft's Web browser. See EXPLORER.EXE, file manager, Win Explorer and Internet Explorer.