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2001 Mars Odyssey
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Communications Relay

Odyssey is serving as a communications relay station for the twin NASA Mars Exploration Rovers. Odyssey has transmitted 85% of the data from Spirit and Opportunity to Earth and will continue to provide the relay function throughout the rovers' and Odyssey's extended mission. Odyssey will also relay data from future Mars landed missions.
This image shows one of the Mars Exploration Rover Opportunity's first breathtaking views of the martian landscape after its successful landing at Meridiani Planum on Mars.
Odyssey relayed the first images from the Opportunity rover on landing day and
has continued to send back 85% of all data from the twin rovers. Image Credit: NASA/JPL
Link to Mars Exploration Rovers raw image gallery
Science relay configuration