5 most important unmanned spacecraft

by dwaymire on March 6, 2010

Rovers – The 3 unmanned rovers on Mars have made great contributions to us understanding the red planet.
Viking – First American explorers to Mars
Hubble – Probably the greatest scientific instrument ever built.
Vanguard I – The oldest man made object still in space.
Sputnik – The very first man made object to orbit the Earth.

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