impact theory

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impact theory [′im‚pakt ‚thē·ə·rē]

(astronomy)

A theory which holds that most features of the moon's surface were formed by the impact of meteorites. Also known as meteoric theory; meteoritic theory.

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No references found			That theory was greeted with great skepticism when first proposed in 1984, and the Younger Dryas impact theory is facing the same reception. Tiny diamonds share geologic record with massive extinction by The Register-Guard (Eugene, OR) The impact theory gets even more support from additional findings from other scientists. The two faces of Mars by Cutraro, Jennifer / Science News for Kids Another group, led by Francis Nimmo at the University of California at Santa Cruz, ran a different set of computer simulations that support the impact theory. Cataclysmic impact created the north-south divide on Mars by guardian.co.uk / guardian.co.uk			impact grinding Impact Impulse impact insulation impact insulation class impact ionization impact isolation impact law impact load impact loss impact mark impact microphone impact mill impact modifier impact noise impact noise rating Impact Parameter impact predictor impact pressure impact printer impact resistance impact roll impact screen Impact Strength impact stress impact test impact theory impact tube impact velocity impact wrench impact-noise analyzer impacted Impacted Cerumen impaction impactite impactometer impactor impages Impala imparipinnate Impasto impasto effect Impatiens IMPATT amplifier IMPATT diode impeachment impedance Impedance and Resistance impedance bridge impedance coil impedance compensator impedance component			Impact parameter Impact Performance Group, Inc. Impact Point Prediction Impact Prediction Point impact predictor impact pressure impact pressure impact printer impact printer impact printer Impact Protection Vehicle Impact rating Impact Readiness Force Account Impact Research and Development Organization impact resistance impact roll impact screen Impact Service Corporation Impact Soundworks impact strength impact strength impact strength impact strength impact strength impact stress impact structure Impact Teams International impact test Impact Tested Carbon Steel Impact Tester Addition impact theory impact tube impact velocity Impact World Tour Impact wrench Impact Youth Services impact zone Impact Zone Wrestling Impact-Ionized Hot-Electron Injection impact-noise analyzer Impact-Producing Factor IMPACT-Tz impacted impacted impacted impacted impacted Impacted bowel Impacted bowel Impacted bowel impacted cerumen impacted cerumen impacted crop impacted crop impacted crop impacted crop impacted fetus impacted fracture impacted fracture impacted fracture impacted fracture

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