A. GOOGLE EARTH got it's start in 1972
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Landsat 1, originally named "Earth
Resources Technology Satellite 1",
was the first satellite of the United
States' Landsat program. It was a
modified version of the Nimbus 4
meteorological satellite and was
launched on July 23, 1972 by a Delta 900
rocket from Vandenberg Air Force Base in
California.[1] The near-polar orbiting
spacecraft served as a stabilized,
Earth-oriented platform for obtaining
information on agricultural and forestry
resources, geology and mineral
resources, hydrology and water
resources, geography, cartography,
environmental pollution, oceanography
and marine resources, and meteorological
phenomena.

A. The only one I own : SLX,
too hard pick a winner out all of them