Is the Moon’s atmosphere actually just a collection of cosmic impacts?
In short: The Moon possesses an atmosphere so thin it is called an exosphere, with a density just one 25-trillionth that of Earth’s. To understand this fragile environment, NASA’s LADEE mission looked toward the tiny, high-speed meteoroids that constantly pelt the lunar surface.
The Lunar Atmosphere and Dust Environment Explorer, known as LADEE, orbited the Moon for approximately six months to study the lunar exosphere. This ultra-thin envelope of gases is so tenuous that molecules rarely collide with one another. Because exospheres are the most common atmospheric type in our solar system—surrounding bodies like Mercury, Pluto, and various asteroids—the Moon serves as a vital laboratory for understanding nearly airless worlds.
A primary driver of the exosphere's composition is the constant bombardment of micrometeoroids. These grains, often smaller than the head of a pin, strike the Moon at speeds exceeding 21 miles per second. Unlike on Earth, where such particles burn up in a thick atmosphere, these impacts on the Moon release immense heat, vaporizing both the meteoroids and the lunar soil. This process releases gases into the atmosphere, and LADEE recorded increases in specific gases during periods of higher impact density.
This mechanism has profound implications for lunar resources. Scientists believe that molecules like water vapor, released by these impacts, may migrate across the surface and become trapped in the permanently shadowed regions at the lunar poles. In these frigid areas, molecules slow down and settle as ice. Understanding this cycle is critical, as such reservoirs of water ice could eventually be harvested to produce oxygen, water, and fuel for future space exploration.
Beyond gases, the mission also investigated the lunar dust environment. This dust is notoriously abrasive, having caused significant wear on Apollo-era spacesuits during previous lunar visits.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: Talking LADEE Science
- Also: What is LADEE, the Lunar Atmosphere and Dust Environment Explorer? - NASA
To cite this card, link to https://intellectplus.co.uk/app/space-talking-ladee-science.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Space · Latest · A–Z · All topics
