News ID: 175393
Published: 0320 GMT January 09, 2017

Levitating lunar dust explained

Levitating lunar dust explained

A new study may explain how dust particles on the moon ‘levitate’ just above the surface, even though there is no wind or flowing water on the moon to kick-up the material.

In a recent laboratory study, researchers found that micron-size dust particles could ‘jump’ several centimeters high under ultraviolet (UV) radiation or exposure to plasmas (electrically charged gas), said a statement from NASA, livescience.com reported.

This finding may help researchers better understand how lunar dust is transported across vast regions of the moon and other airless bodies, according to the statement.

"On Earth's moon, these dust particles would have been lofted more than 10 centimeters above the lunar surface, leading researchers to conclude that the moon's horizon glow may have been caused in part by sunlight scattering in a cloud of electrostatically lofted dust particles," NASA officials said.

The moon's horizontal glow is a slim, bright crescent just above the lunar surface, observed by Apollo astronauts.

Scientists think this phenomenon comes from lunar dust particles that scatter light.

The recent study builds on previous research and shows that neighboring dust particles can generate unexpectedly large electrical charges and intense particle-particle repulsive forces, which lift particles of various sizes off the lunar surface, NASA officials said.

What's more, this electrostatic dust mobilization may help explain the formation of ‘dust ponds’ on asteroid Eros and Comet 67P/Churyumov-Gerasimenko, as well as the smooth surface on Saturn's icy moon Atlas, according to the study published in the journal Geophysical Research Letters.

Xu Wang, first author of the study and a member of NASA's Lunar Science Institute at the University of Colorado Boulder, said, "This new 'patched charge model' resolved a fundamental mechanism of dust charging and transport, which has been puzzling scientists for decades.

"We expect dust particles to mobilize and transport electrostatically over the entire lunar surface, as well as the surface of any other airless planetary body."

   
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