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The interplanetary internet has been used by an astronaut at the International Space Station (ISS) to send commands to a robot on Earth. The experimental technology, called Disruption-Tolerant Networking (DTN) protocol, could be a future way to communicate with astronauts on Mars. Currently, if there is a problem when data is sent between Earth and Mars rovers, information can be lost.
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http://www.bbc.co.uk/news/technology-20270833
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