Nasa has announced a second opportunity for small satellite payloads to fly on rockets planned to launch in 2011 and 2012.

The CubeSats, about 4in long and weighing less than 2.2lb, could be auxiliary cargo on previously planned missions.

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The research spacecraft should be focused on aspects of science, exploration, technology development, education or operations.

Nasa recently announced results from the first round of the CubeSat launch initiative and 12 payloads have made the shortlist for launch opportunities in 2011 and 2012.