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Whence comets?

Michael F A'Hearn1

  • 1Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA. ma@astro.umd.edu

Science (New York, N.Y.)
|December 16, 2006
PubMed
Summary
This summary is machine-generated.

The Stardust mission reveals extensive, early mixing of materials in the early solar system. This finding challenges current theories on protoplanetary disk evolution and comet formation.

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Area of Science:

  • Planetary Science
  • Cosmochemistry
  • Cometary Science

Background:

  • Recent cometary science suggests material mixing in the early solar system disk.
  • Understanding this mixing is crucial for planet formation theories.

Purpose of the Study:

  • To analyze material composition from comets using data from the Stardust mission.
  • To investigate the extent and timing of material mixing in the protoplanetary disk.

Main Methods:

  • Analysis of returned samples from comet Wild 2 by the Stardust mission.
  • Characterization of cometary dust and ice composition.

Main Results:

  • Stardust mission data provides unambiguous evidence for extensive material mixing.

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  • Evidence indicates this mixing occurred earlier in the solar system's history than previously thought.

    • Conclusions:

    • The findings necessitate revisions to existing models of protoplanetary disk dynamics.
    • New theories are required to explain the observed early and widespread material mixing and its impact on comet formation.