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Perseid Meteor Shower Meteor Showers • As a comet travels close to the Sun, it heats up and part of the comet vaporizes leaving a lot of small pieces of the comet along the comet's path. • A meteor shower happens when Earth passes through the path of a comet and small fragments of comet debris burn in the earth’s atmosphere. • The meteor showers can be predicted and occur at the same time each year. Comets leave debris on their orbit! • Unlike the nearly circular orbits of the planets, the orbits of comets are usually quite lop-sided. As a comet gets closer to the Sun, some of its icy surface boils off, releasing lots of particles of dust and rock. • Several times each year, as Earth makes its journey around the Sun, its orbit crosses the orbit of a comet, which means Earth smacks into a bunch of comet debris. What is the Perseid Meteor Shower? • The Perseid meteor shower is caused by debris from Comet Swift-Tuttle. • Every 133 years the huge comet swings through the inner solar system and leaves behind a trail of dust and gravel. Comet Swift-Tuttle • When Earth passes through the debris, specks of comet-stuff hit the atmosphere at 140,000 mph and disintegrate in flashes of light. Meteor Shower Names • Meteor showers are usually named for the constellation in which their radiant lies at the peak of the shower. • Perseid shower = Perseus • Leonid shower = Leo • Geminid shower = Gemini Perseid Radiant Geminid Radiant • The Perseids are a popular attraction in the night sky in August each year. Perseids striking the Moon! • Since it has no protective atmosphere, the moon does not ever experience meteor showers like Earth does. Instead, every incoming object makes it straight to the lunar surface. The rain of meteoroids creates miniature craters on the moon and steadily erodes the landscape. Meteoroid • Meteoroid- small, solid body moving within the solar system usually debris associated with comets or asteroids. • When a meteoroid enters the Earth’s atmosphere it is traveling at 60-70 km per second and becomes a meteor! Meteor • Meteor- (shooting star)- bright trail of light created by small solid particles entering the Earth’s atmosphere & burning up. • The typical size of a meteor that produces a visible streak of light ranges from about the size of a grain of sand to the size of a small pebble! The average weight is only around 1 gram! Fire Balls • Fire balls are large, brilliant meteors that may weigh up to several kilograms or more. • On a given night, with favorable conditions, you can see 1 meteor every 15 minutes Meteorite • Meteorite - solid remains of a meteor that falls to the Earth. Hoba meteorite (Namibia) is the largest meteorite ever found. It is tabular in shape of 66-ton of iron, about nine feet long, nine feet wide and about three feet thick. Resources http://www.popastro.com/meteor/index.php https://www.youtube.com/watch?v=c5mPCF5LFfE