Sticky Lunar Dust - Sun's Elevation Made The Difference

In the 1960s and early 1970s, the Apollo Moon Program struggled with a formidable enemy that was sometimes more formidable than others: sticky lunar dust. Four decades later, a new study says they now know why; forces that compel lunar dust to cling to surfaces change during the lunar day - with the elevation of the sun. The study analyzes the interactions on the Moon among electrostatic adhesive forces, the angle of incidence of the sun's rays, and lunar gravity. It concludes that the stickiness of lunar dust on a vertical surface changes as the sun moves higher in the sky, eventually allowing the very weak lunar gravity to pull the dust off. read more

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