micrometeorite
Definition
- Noun:
- A very small meteorite: A micrometeorite is a particle of extraterrestrial matter, such as a tiny meteoroid or fragment of a meteoroid, that is so small it survives its passage through the Earth's atmosphere without being vaporized by intense heat. It drifts down and lands on the Earth's surface.
Usage
- The term micrometeorite is used specifically in the contexts of astronomy, planetary science, and geology to describe the smallest category of meteoritic material found on Earth.
- It refers to particles typically smaller than about 1 millimeter in diameter.
Examples
- Noun:
- Scientists collected micrometeorites from the Antarctic ice for study.
- The satellite's shield was designed to withstand impacts from micrometeorites.
- Under the microscope, the micrometeorite revealed a spherical shape formed during its atmospheric entry.
Advanced Usage
- Micrometeorite flux: This phrase refers to the rate at which micrometeorites accumulate on a surface over time, an important measurement for spacecraft design and lunar science.
- The study aimed to calculate the micrometeorite flux on the lunar surface.
Variants and Related Words
- Micrometeoroid (noun): The term for a very small meteoroid while it is still in space, before it enters a planetary atmosphere. A micrometeorite is a micrometeoroid that has landed.
- Meteorite (noun): A natural object from space that survives its passage through the atmosphere and lands on a planet's surface. A micrometeorite is a very small meteorite.
- Cosmic dust (noun): Fine particles of matter in space. Micrometeorites are a component of cosmic dust that reaches the ground.
Synonyms
- Cosmic dust particle: (In specific contexts where it refers to a particle that has landed.)
- Interplanetary dust particle (IDP): A technical synonym often used in scientific literature.
Related Phrases/Compounds
- Micrometeorite ablation: The process where the outer layer of a micrometeoroid melts or vaporizes during atmospheric entry.
- Micrometeorite collection: The act or process of gathering these particles, often from remote locations like polar ice or deep-sea sediments.
Noun
-
a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere
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