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Once the two GRAIL satellites are in orbit, their next step is to begin a five week phase in which they increase the speed at which they orbit the Moon.
FORBES: NASA's GRAIL Mission Will Unlock Secrets Of The Moon's Interior
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The craft is meant to speed off a runway and accelerate gracefully into orbit in a single blast, perform a task like launching a satellite and then glide back home to its hangar.
BBC: Skylon: A British dream of space
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Alongside the HTC-made handset are an altitude and orbit control system, two propulsion setups and a Linux-based computer with a "high-speed" processor.
ENGADGET