Apollo 11 was the spaceflight that first landed humans on the Moon. It was one of the most-awaited occasion for all the NASA’s team and…
Images from NASA‘s Mars Reconnaissance Orbiter show sand dunes and ripples moving across the surface of Mars at dozens of locations and shifting up to several yards. These observations reveal the planet’s sandy surface is more dynamic than previously thought. According to Matthew Golombek, a co-author of the new paper and a member of the Mars Exploration Rover and Mars Reconnaissance Orbiter teams at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., sand moves by hopping from place to place. Not all of the sand on Mars is blowing in the wind. The study also identifies several areas where the bed forms did not move. According to scientists, the seemingly stationary areas might move on much larger time scales, triggered by
climate cycles on Mars that last tens of thousands of years. The tilt of Mars’ axis relative to its orbital plane can vary dramatically. Mars may once have been warm enough that the carbon dioxide now frozen in the polar ice caps could have been free to form a thicker atmosphere, leading to stronger winds capable of transporting sand.
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