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Satellites aren't always the size of a large car or a small house. The QuakeSat, pictured here, consists of three CubeSats and would fit in the backseat of a modest sedan. In 2003, it orbited Earth looking for signs of earthquakes.
Student CubeSats on display at Aalborg University in Denmark.
Stanford University professor Bob Twiggs is one of the driving forces behind the CubeSat project. He's been working on tiny orbital designs since the mid-1980s. Here he's holding one of the early CubeSat models.