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Without new landers or rovers, it's helicopters or bust for NASA's Mars program

NASA's cost estimate for SR-1 Freedom is $2.1 billion, but that doesn't include the helicopters.

Features Science Space Aerovironment jet propulsion laboratory Mars mars helicopter NASA planetary science skyfall solar system space reactor-1

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Engineers at NASA's Jet Propulsion Lab make a breakthrough in rotor technology

Testing shows rotor blades won't disintegrate when they spin at supersonic speed.

Science Space jet propulsion laboratory Mars mars ingenuity NASA planetary science skyfall solar system