cosmic dust

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Particles with a wide range of masses (10-2–10-18 g) and velocities occurring in interplanetary, circumstellar, and interstellar space. They are typically porous with low densities and a ‘cluster of grapes’ morphology, but many are compact with densities of about 2000 kg/m3. Most particles collected from the stratosphere are comprised of layer lattice silicates, olivine, or pyroxene. In the terrestrial neighbourhood, they are mostly derived from comets and asteroids.

Subjects: Earth Sciences and Geography.

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