Artificial satellites
The USSR'S Sputnik 1 was the first artificial satellite to enter Earth's orbit. This 83.6kg metal sphere transmitted signal back to earth for three weeks before its batteries failed. In 1958 the USA began to launch its own satellites. Five went into orbit, including SCORE which transmitted back to Earth a pre recorded Christmas message from president Eisenhower. All of the earliest satellites have since crashed back to Earth, except Vanguard 1 wich is still in space and likely to remain so for another 200 years.
The USSR'S Sputnik 1 was the first artificial satellite to enter Earth's orbit. This 83.6kg metal sphere transmitted signal back to earth for three weeks before its batteries failed. In 1958 the USA began to launch its own satellites. Five went into orbit, including SCORE which transmitted back to Earth a pre recorded Christmas message from president Eisenhower. All of the earliest satellites have since crashed back to Earth, except Vanguard 1 wich is still in space and likely to remain so for another 200 years.
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