Explore: Meteoroid Concentration

planetary systems, though the most frequent involve asteroids, comets or meteoroids and have minimal effect. When large objects impact terrestrial planets

February 2013, at Chelyabinsk in the Ural district of Russia. The exploding meteoroid was determined to have been an asteroid that measured about 17–20 metres

more abundant, and different in composition. The IAU officially defines meteoroids as 30 micrometers to 1 meter; micrometeorites are the small end of the

mass of the original meteoroid that entered Earth's atmosphere to produce the meteorite (also called post-atmospheric mass). Meteoroids that produce meteorites

caused by iron meteoroids, which are most easily able to transit the atmosphere intact. Examples of craters caused by iron meteoroids include Barringer

turn, the history of Earth led to parts of the planet having differing concentrations of the elements. The mass of the Earth is approximately 5.97×1024 kg

T. J.; Cook, A. M.; Shirley, M. (2015). "How surface composition and meteoroid impacts mediate sodium and potassium in the lunar exosphere". Science

formed over the last 4.6 billion years from the impact of large and small meteoroids, from the steady bombardment of micrometeoroids and from solar and galactic

has media related to Mare Imbrium. Phillips, Tony (13 June 2006). "A Meteoroid Hits the Moon". Science@NASA. Archived from the original on 16 June 2006

or soil, in Earth's atmosphere, and in extraterrestrial items such as meteoroids. By measuring cosmogenic nuclides, scientists are able to gain insight