Comets, Asteroids, & Meteoroids - Mrs. Logan...
Transcript of Comets, Asteroids, & Meteoroids - Mrs. Logan...
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Comets, Asteroids, & Meteoroids
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SPI 6.1Use data to draw
conclusions about the major components of the
universe.
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Comets, Asteroids, & Meteors
The solar system contains many other types of objects, including comets, asteroids, and meteoroids.
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Comets A comet is a small body of ice, rock, and cosmic dust loosely packed together.
Known as “dirty snowballs.”
*Add to notes:
Comet = cold*
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CometsWhen a comet passes close enough to the sun, solar radiation heats the water ice so that the comet gives off gas and dust in the form of a long tail.
The ion tail consists of electrically charged particles of gas.
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Comet OrbitsThe difference between the orbit of a planet and the orbit of a comet is that a comet's orbit is highly elliptical and a planet's orbit is only slightly elliptical, but more circular.
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Comet OrbitsThe comet’s ion tail always extends awayfrom the sun. This is because the ion tail is blown away from the sun by the solar wind.
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AsteroidsAsteroids are small, rocky bodies in orbit around the sun.
Have irregular shapes
*Add to notes:
Asteroids are astronomical (big)*
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AsteroidsMost asteroids orbit the sun in a wide region between the orbits of Mars and Jupiter, called the asteroid belt.
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MeteoroidsA meteoroid is a small, rocky body orbiting the sun.
Meteoroids are similar to asteroids, but they are much smaller.
*Add to notes: meteoroids are mini-
asteroids*
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Meteoroids
In fact, meteoroids probably come from asteroids.
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Meteor
As it burns up, the meteoroid glows red hot and gives off an enormous amount of light.From the ground we see a streak of light or shooting star.The bright streak of light caused by a meteoroid or comet dust burning up in the atmosphere is called a meteor.
*Add to notes: meteor = shooting star*
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Meteorite
If a meteoroid enters Earth’s atmosphere and strikes the ground, it is then called a meteorite.It travels at such high speeds that it heats up and melts.Meteorites that hit the ground can cause craters.*Add to notes: Meteorites hit RIGHT on the Earth’s surface*
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Meteorite Crater
Planets and moons that have no atmosphere have many more impact craters than those that do have atmospheres.
Earth’s atmosphere acts like a shield.
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➢Add the following words to the front of your notes. Give yourself some space between each word.
Comet
Asteroid
Meteoroid
Meteor
Meteorite
➢You will create your own short description for each word. How will you remember the differences?