Comets, Asteroids, and Meteoroids - PowerPoint PPT Presentation

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Comets, Asteroids, and Meteoroids

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Tail also glows by the reflecting sunlight. It always points away from the solar winds ... The most popular comet. Orbits every 76 years. Halley's Comet. Asteroids ... – PowerPoint PPT presentation

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Title: Comets, Asteroids, and Meteoroids


1
Comets, Asteroids, and Meteoroids
2
Comets
  • Three Parts of the Comets
  • Head (nucleus) glows by reflecting sunlight
  • Coma hazy cloud that surrounds the nucleus
  • Tail also glows by the reflecting sunlight
  • It always points away from the solar winds
  • When they come close to the earth the solar winds
    hit the coma the winds drive gas particles away
    form the coma (this is why the tail always points
    away from the sun)

3
Where are these comets
  • They spend most of their time beyond Pluto
  • Many of them can only be seen through a telescope
  • Most have long, elongated orbits
  • The closest one, Enckes, returns every 3.3 years

4
Enckes Comet
5
Halleys comet
  • Named after Edmund Halley, an 18th century
    astronomer
  • The most popular comet
  • Orbits every 76 years

6
Halleys Comet
7
Asteroids
  • They are solid rocklike masses
  • Most seems to have irregular shapes
  • Most are less then 1 km long
  • Planet like masses that are usually found beyond
    Mars (Asteroid Belt)

8
Asteroids
9
Meteors and Meteoroids
  • Meteoroid is a rock or an icy fragment traveling
    in space
  • Large as boulders
  • Small as grains of sand
  • Meteor is the light made by a meteoroid as it
    passes through the Earths atmosphere.
  • FIREBALL -gt an unusually bright meteor

10
Meteoroid
11
Meteor
12
Meteor showersMeteoroid swarms
  • Meteor swarms - When meteors travel in billions
    of particles
  • Meteor showers When Earth comes in contact with
    meteor swarms, which happen several times a year.

13
Meteor showers
14
Meteor swarms
15
Meteorites
  • Is part of a large meteoroid that survives its
    trip through the atmosphere and strikes the Earth
  • 3 Types of Meteorites
  • Stones
  • 93 of the fall under this category
  • Irons
  • 85 90 percent of these Meteorites are made of
    Iron
  • Stony- Irons
  • Mixture of stone and iron

16
Meteorites
17
Stones
18
Irons
19
Stony - Iron
20
Meteorite Craters
  • Mainly found on other planets and their moons
  • Earth still has some meteorite impacts that have
    happened recently25,000 years ago when an iron
    meteorite about 20 meters in diameter struck
    Earths Surface and explodedleaving a crater
    1300 meters in diameter and nearly 200 meters deep

21
Meteors
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