Distinctive impact craters are formed by organic rich cometary dust grains
نویسندگان
چکیده
A. T. Kearsley, M. J. Burchell, M. C. Price , S. F. Green, I. A. Franchi, J. C. Bridges, N. Starkey, M. J. Cole. IARC, Dept. of Mineralogy, Natural History Museum, London, SW7 5BD, UK, ([email protected]), School of Physical Science, University of Kent, Canterbury, CT2 7NH, UK, PSSRI, Open University, Milton Keynes, MK7 6AA, UK, Space Research Centre, Dept. of Physics and Astronomy, University of Leicester, LE1 7RH, UK.
منابع مشابه
Organic matter in comets and cometary dust.
Comets are primitive conglomerates of the solar system containing a mixture of frozen gases, refractory grains, and carbonaceous particles rich in biogenic elements. The dramatic display of comets is mostly caused by a cloud of micrometer-sized dust particles that leave the comet nucleus when frozen gases sublimate as they approach the Sun. Analyses of cometary dust captured in the stratosphere...
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The fluence of dust particles < 10 micrometres in diameter was recorded by impacts on aluminium foil of the NASA Stardust spacecraft during a close fly-by of comet 81P/Wild 2 in 2004. Initial interpretation of craters for impactor particle dimensions and mass was based upon laboratory experimental simulations using >10 μm diameter projectiles and the resulting linear relationship of projectile ...
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تاریخ انتشار 2009