An immense dust storm that may soon encircle Mars is threatening one of NASA's rovers on the planet's surface, with the vehicle becoming dormant and unresponsive at a site called Perseverance Valley, U.S. space agency officials said on Wednesday.
Scientists have detected another exotic feature on one of the solar system's most wondrous worlds, a large field of dunes on the surface of the distant, frigid dwarf planet Pluto apparently composed of wind-swept, sand-sized grains of frozen methane.
NASA said it will send a small helicopter to Mars as part of the U.S. space agency's 2020 mission to place a next-generation rover on the Martian surface, marking the first time such an aircraft will be used on another world.
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