After five decades of reconnaissance by flyby missions, orbiters, landers and rovers, Mars may be prime for scrutiny from the air, according to scientists and engineers gathered for a NASA-sponsored Mars Program Planning Group (MPPG) workshop organized by the space agency to forge an exploration strategy that achieves more with less. Proponents presented the three-day gathering with plans for unmanned hypersonic aircraft, slow-moving UAVs, ultra lights and balloons toting cameras, ...


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