HYDERABAD, India - European Space Agency (ESA) engineers are open to collaboration with NASA and other agencies on a Mars Sample Return (MSR) mission, but they're not so sure about rigging the planned ExoMars rover with a sample cache for return to Earth later. "The idea is an excellent one," said Piero Messina of the agency's exploration program office in Paris. "We all are very much interested in returning samples from Mars, but ... it all depends on what this caching means in terms of ...

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