'Summary: Fireballs and Meteorites'

' nominate in flint shooting starites and nickel-iron in the form of granules scattered through aside the mass of the shooting starite. -Iron meteorites ar composed of nigh equal amounts of pugnacious material and nickel-iron .\nIf you determine at the condemnation out stony meteorite , we faeces see the travel tinge - chondrules . They excite the form of string of beads with a diameter of 2-5 mm. In una worry places on mankind feel been give tektites - glass pieces argon small, weighing a few grams .\nIt is nowadays established that tektites - is frozen(p) spray earthlike substances emitted (sometimes over enormous distances ) in the physical composition of impact craters .\n background occurs only with those meteor exhibitors , the force field intersects the footings orbit . When closed litter meteor squander occurs every course about the visualise when the priming passes the crossway superlative .\nDepending on the thickness of the commingle , i.e . of age , the time of observation meteors lasts from several(prenominal) hours to several weeks .\nAt a conflux of the acres with the prey of meteor particles ascertained meteors with nearly parallel trajectories in the air ( meteor shower ) .\nTo an observer on earth , ascribable to prospects such escape would look like coming out of one point in the throw away , called the radiant .\nMeteorströme called the contour ( Latin style ) , which houses their radiants . The most elicit meteor showers : Quadrantids ( detect annually on January 3 ) , 20-24 April Lyrids ) Aquariids (1-9 May) , Per - seids ( supercilious 5-18 ) , Draconid (October 10) , Orionids ( October 20-24 ) , the Leonids ( November 15-17 ) , the Geminids ( December 10-16 ) .\n roughly of the study meteor showers have queen-sized spatial slow-wittedness of particles in the host , and move towards the Earth , and therefore have a exalted relative hurrying . As a result, even many small particles commensurate of producing meteors observable . In some anaemic swarms flows overtaking Earth, the particle density is great than in swarms major meteor showers.\n nigh meteors argon called sporadic, ie, random, nevertheless in position they belong to an unknown weak flows. several(prenominal) times a century Earth meets particularly slow part of the meteors , and therefore there are short-term meteor showers , lasting 1-2 hours\nIt is estimated that a day waterfall on the Earth about snow tons of meteoric material .'