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Cosmic spherules are micrometeorites that melted when they plunged through Earth’s atmosphere. Thousands have been colle

Melted Crumbs from Asteroid Vesta. Cosmic spherules are micrometeorites that melted when they plunged through Earth’s atmosphere. Thousands have been collected from Antarctic ice. Melted Crumbs from Asteroid Vesta.

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Cosmic spherules are micrometeorites that melted when they plunged through Earth’s atmosphere. Thousands have been colle

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  1. Melted Crumbs from Asteroid Vesta • Cosmic spherules are micrometeorites that melted when they plunged through Earth’s atmosphere. • Thousands have been collected from Antarctic ice. www.psrd.hawaii.edu/Sept07/cosmicSpherules.html

  2. Melted Crumbs from Asteroid Vesta • Fe/Mn and Fe/Mg ratios distinguish chondrites (shaded region) from 7 achondrites (blue points) • The achondritic cosmic spherules plot near the dashed line for values typical of HED (basaltic) meteorites • Plagioclase in one of the achondritic cosmic spherules has similar composition to that in HEDs www.psrd.hawaii.edu/Sept07/cosmicSpherules.html

  3. Melted Crumbs from Asteroid Vesta • The HEDs have reflectance spectra that match spectra from asteroid 4 Vesta, implying Vesta is their parent body. • Thus, these cosmic spherules may be crumbs from Vesta. www.psrd.hawaii.edu/Sept07/cosmicSpherules.html

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