Monthly Archives: September 2011

Can melting snow make small holes in Mars rocks?

Many rocks on the surface of Mars show pits and small holes. One way such pits can form is when gas-rich lava erupts; the pits, called “vesicles,” form when gas escapes from the lava as it’s cooling. Wind-driven sand can … Continue reading

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Seeing Mars on the fly

Mars has as much surface territory as all the land areas of Earth, and scientists have barely touched the planet at ground level, despite 35 years of lander and rover missions. So maybe it’s time to send a hopper. Hugo … Continue reading

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Making fans all over

Water and sediment run downhill, on Earth and Mars alike. And when they do, they build broad alluvial (outwash) fans at the foot of slopes. But how fast do these fans accumulate? On Mars, at least, it looks like they … Continue reading

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NASA’s long road to Gale Crater

If Gale Crater isn’t your favorite choice for a landing site for NASA’s next Mars rover, you can’t claim the choice was made hastily. The international community of Mars scientists thoroughly sifted the Red Planet to find a feasible landing … Continue reading

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Water-related minerals in Noctis Labyrinthus

Noctis Labyrinthus, created 2 to 3 billion years ago, is a sprawling network of intersecting valleys and troughs between the Tharsis volcanic highlands and Valles Marineris. Deep within its troughs, canyon walls and floors display beds of layered rocks and … Continue reading

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Devilry in the air

With all the spacecraft orbiting Mars, it’s slightly surprising that there aren’t more observations of dust devils shared by two or more instruments. Writing in the September 2011 issue of Icarus, a team of scientists led by Dennis Reiss (Westfälische … Continue reading

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