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Related Experiment Videos

The impact rate on Earth.

Philip A Bland1

  • 1Imperial College London Department of Earth Science and Engineering South Kensington Campus, London SW7 2AZ, UK. p.a.bland@imperial.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 16, 2005
PubMed
Summary
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The evolutionary and ecological benefits of asteroid and comet impacts.

Trends in ecology & evolution·2006

Asteroid impacts are a significant natural hazard, but new data and modeling now define their size-frequency distribution. This allows for better prediction and mitigation of threats to human populations from space.

Area of Science:

  • Planetary Science
  • Atmospheric Science
  • Geophysics

Background:

  • Asteroid impacts pose a natural hazard to Earth.
  • Understanding the frequency and size of impactors is crucial for risk assessment.

Purpose of the Study:

  • To define the complete size-frequency distribution of terrestrial impactors.
  • To constrain the threat posed by asteroid impacts to human populations.

Main Methods:

  • Analysis of recent data on asteroid-atmosphere interactions.
  • Development of models for impactor behavior in the atmosphere and at the surface.

Main Results:

  • A complete size-frequency distribution for terrestrial impactors, from meteorites to kilometer-sized asteroids, has been established.

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  • Estimates constrain the threat posed by impacts to human populations, despite uncertainties in specific size-fractions.

    • Conclusions:

    • Asteroid impacts remain a significant natural hazard.
    • Impact threats can be accurately predicted, enabling proactive avoidance strategies.