METEORS, METEOROIDS, AND METEORITES .


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. A meteor is a splendid dash of light in the sky (a \"shooting star\" or a \"falling star\") created by the passage of a little meteoroid into the Earth\'s air. In the event that you have a dull clear sky you will most likely see a couple for every hour on a normal night; amid one of the yearly meteor showers you may see upwards of 100/hour. Bright meteors are known as fireballs..
Transcripts
Slide 1

METEORS, METEOROIDS, AND METEORITES

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A meteor is a splendid dash of light in the sky (a "shooting star" or a "falling star") delivered by the section of a little meteoroid into the Earth\'s air. On the off chance that you have a dim clear sky you will most likely observe a couple for every hour on a normal night; amid one of the yearly meteor showers you may see upwards of 100/hour. Bright meteors are known as fireballs.

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Meteorites are bits of the nearby planetary group that have tumbled to the Earth. Most originate from space rocks, including few are accepted to have come particularly from 4 Vesta; a couple presumably originate from comets. A little number of shooting stars have been appeared to be of Lunar (23 finds) or Martian (18) birthplace. One of the Martian shooting stars, known as ALH84001 (above), is accepted to show confirmation of early life on Mars.

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Meteorite Statistics Type Fall % Find % Fall Weight(kg) Find Weight(kg) Stony 95.0 79.8 15200 8300 Stony-Iron 1.0 1.6 525 8600 Iron 4.0 18.6 27000 435000

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Iron: principally iron and nickel

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IRON METEORITE WIDMANNSTATTEN PATTERN

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IRON METEORITE

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IRON METEORITE

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Stony-Iron: blends of iron and stony material

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STONY IRON METEORITE

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Chrondite: by a long shot the biggest number of shooting stars fall into this class comparable in organization to the mantle and coverings of the earthbound planets

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Achrondite: like earthly basalts; the shooting stars accepted to have started on the Moon and Mars are achondrites

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JOHNSTOWN METEORITE

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TECTITES

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Peekskill Fireball

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MICROMETEOR CRATER ON MOON DUST

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KNOWN CRATERS IN THE UNITED STATES

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CRITERIA FOR DETERMINING IMPACT CRATERS

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A great case of what happens when a little space rock hits the Earth is Barringer Crater (a.k.a. Meteor Crater) close Winslow, Arizona. It was shaped around 50,000 years prior by an iron meteor around 30-50 meters in width. The hole is 1200 meters in distance across and 200 meters profound. Around 120 effect pits have been distinguished on the Earth.

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The normal meteoroid enters the environment at in the vicinity of 10 and 70 km/sec. Be that as it may, everything except the extremely biggest are immediately decelerated to a couple of hundred km/hour by barometrical grinding and hit the Earth\'s surface with almost no flourish. However meteoroids bigger than a couple of hundred tons are moderated practically nothing; just these extensive (and luckily uncommon) ones make pits.

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There are presumably no less than 1000 space rocks bigger than 1 km in distance across that cross the circle of Earth. One of these hits the Earth about once in 300,000 years all things considered. Bigger ones are less various and effects are less successive, however they do once in a while happen and with deplorable results. The effect of a comet or space rock about the span of Hephaistos or SL9 hitting the Earth was likely in charge of the annihilation of the dinosaurs 65 million years prior. It cleared out a 180 km pit now covered beneath the wilderness close Chicxulub in the Yucatan Peninsula.

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REALLY BAD DAY

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Meteor Impact Site, Quebec

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A later effect happened in 1908 in a remote uninhabited area of western Siberia known as Tunguska. The impactor was around 60 meters in width and presumably comprising of many inexactly bound pieces. Rather than the Barringer Crater occasion, the Tunguska question totally crumbled before hitting the ground thus no cavity was shaped. All things considered, every one of the trees were smoothed in a region 50 kilometers over. The sound of the blast was heard most of the way around the globe in London.

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