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How do scientists collect micrometeorites from Earth’s atmosphere and polar ice?
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Meteor and meteoroid
The Cabin Creek meteorite, an iron (nickel-iron alloy) meteorite that was observed to fall in northwestern Arkansas on March 27, 1886. Its characteristic pattern of “thumbprint” dimples, or regmaglypts, is the result of melting and consequent ablation of its surface as it traveled through the atmosphere. The meteorite is likely a fragment of one of the M class asteroids, which show significant nickel-iron in their surface material.
Scientists employ specific methods to recover micrometeorites—small particles of cosmic dust—from Earth's atmosphere and polar regions, as these samples provide valuable insights into the early solar system.1
Collection Methods
- Stratospheric Collection: The U.S. National Aeronautics and Space Administration utilizes high-altitude research aircraft to collect cosmic dust directly from the stratosphere. This environment is preferred because the concentration of terrestrial dust is relatively low.1
- Polar Ice Filtration: Because larger particles (greater than 50 micrometres) are uncommon in the stratosphere, they are instead recovered from polar regions. Scientists collect these by filtering sediment from large volumes of melted polar ice.1
- Other Sources: Micrometeorites have also been recovered from urban rooftops, where they settle after surviving atmospheric entry.1
While these methods focus on smaller particles, larger meteorites are often recovered from Antarctica, where ice flow and wind erosion concentrate them on the surface, making them easier to identify against the ice.2