A strange, lopsided dust cloud shrouds Earth’s moon, ever skewed toward whichever side is facing the sun. Now, a new study may finally explain how the asymmetrical cloud got its shape.
Most of the moon’s surface is covered by a layer of gray dust and loose rocks. This layer, called regolith, arises because the lunar surface is constantly bombarded by micrometeoroids — tiny space rocks created by asteroid collisions and comets. Without a protective atmosphere — which, in Earth’s case, causes micrometeoroids to burn up as “shooting stars” — the moon is struck by several tons of micrometeoroids daily. These impacts, in turn, grind the regolith’s rocks to dust.
The micrometeoroids also lift lunar dust. In 2015, researchers found that this rising dust creates a massive cloud that extends several hundred miles above the lunar surface. The cloud isn’t very thick, and it’s not visible to the naked eye, Sébastien Verkercke, a postdoctoral researcher at the Centre National D’Etudes Spatiales (France’s national space agency) in Paris and the new study’s first author, told Live Science in an email.
“Writer Fuel” is a series of cool real-world stories that might inspire your little writer heart. Check out our Writer Fuel page on the LimFic blog for more inspiration.
