Earth observation satellite
Earth observation satellites or Earth remote sensing satellites are satellites specifically designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc. 
The first occurrence of satellite remote sensing can be dated to the launch of the first artificial satellite, Sputnik 1, by the Soviet Union on October 4, 1957. Sputnik 1 sent back radio signals, which scientists used to study the ionosphere.
NASA launched the first American satellite, Explorer 1, in January 31, 1958. The information sent back from its radiation detector led to the discovery of the Earth's Van Allen radiation belts.
The TIROS-1 spacecraft, launched on April 1, 1960 as part of NASA's TIROS (Television Infrared Observation Satellite) Program, sent back the first television footage of weather patterns to be taken from space.
, more than 150 Earth observation satellites were in orbit, recording data with both passive and active sensors and acquiring more than 10 terabits of data daily.
Jay Barbree
In 1958, while in a restroom, Barbree overheard a general and a NASA official, talking about an upcoming launch called "Project SCORE", one of the earliest American satellites. This would become one of Barbree's many "scoops", when after a bit of digging, he found that President Dwight D. Eisenhower would use the satellite to broadcast a pre-recorded Christmas message from outer space. When SCORE launched in 1958, Barbree broadcast the story, knowing the military would not deny it once the satellite was in space.