Chapter 17

Lesson 3By Group 1

VocabularyVocabulary AsteroidAsteroid- A rocky mass up to several hundred km - A rocky mass up to several hundred km

revolve around the sunrevolve around the sun CometComet-- A comet is a frozen mass of different types A comet is a frozen mass of different types

of ice and dust orbiting the sun.of ice and dust orbiting the sun. NucleusNucleus- A very small substance that is made up of - A very small substance that is made up of

dust and ice.dust and ice. ComaComa- A cloud of dust and evaporated gases that - A cloud of dust and evaporated gases that

surrounds the nucleus.surrounds the nucleus. MeteorsMeteors- a shooting star- a shooting star MeteoroidsMeteoroids-a small asteroid-a small asteroid MeteoritesMeteorites-a piece of a meteor that doesn’t burn up-a piece of a meteor that doesn’t burn up

CometsComets

Comets come from areas around the solar system.Comets come from areas around the solar system. During the year, several comets travel into the solar system During the year, several comets travel into the solar system

and orbit then sun.and orbit then sun. Comets path is elliptical through the solar system.Comets path is elliptical through the solar system.

A comets tail points in different directions and different A comets tail points in different directions and different spots along it’s orbit.spots along it’s orbit.

FactFact Hailey’s comet is probably the most popular comet. It Hailey’s comet is probably the most popular comet. It

passes the sun about every 76 yearspasses the sun about every 76 years

•Comets come from areas around the solar system.•During the year, several comets travel into the solar system and orbit the sun.•Comets path is elliptical through the solar system.•A comets tail points in different directions and different spots along it’s orbit.

Fact•Halley’s comet is probably the most popular comet. It passes the sun about every 76 years

Comets

• Sometimes called minor planetsSometimes called minor planets• Asteroids are uneven shapesAsteroids are uneven shapes• Smaller asteroids orbit bigger onesSmaller asteroids orbit bigger ones• The smallest asteroids are pebble-sizedThe smallest asteroids are pebble-sized• Most asteroids complete a revolution in 3-6 yearsMost asteroids complete a revolution in 3-6 years• Most asteroids orbit the asteroid beltMost asteroids orbit the asteroid belt• The largest asteroids are spherical with a diameter of 250-1000The largest asteroids are spherical with a diameter of 250-1000• Asteroid Ida is the main asteroid between Mars and JupiterAsteroid Ida is the main asteroid between Mars and Jupiter• Asteroid Eros became the first asteroid to be orbited and landed Asteroid Eros became the first asteroid to be orbited and landed upon a spacecraft.upon a spacecraft.

Asteroid Ida

Asteroids

Meteors

When Earth passes through the path of a comet it causes a meteor shower.

A shooting star is a meteor

Most meteors burn up before they hit Earth’s surface because of friction.

A meteor is formed when a meteoroid hits Earth’s atmosphere.

Meteoroids

A meteoroid is a small asteroid. They can be about the size of a boulder or smaller. Most of the time they are the size of a pebble or a grain of sand. When a meteoroid passes through Earth's atmosphere it heats up very quickly and if it gets hot enough, it will create a glowing streak through the sky. When this occurs it is called a fireball.

MeteoritesA meteorite is a piece of a meteor that doesn’t

burn up while the meteor is falling. It lands on Earth and creates a crater. The meteorite is usually quite small.

Where do comets come from? When a meteoroid creates a glowing streak

through the sky what is it called? What is a meteorite? What is a meteor? What are asteroids sometimes called?

Answers!!! Comets come from areas around the solar

system. It is called a fireball. A meteorite is a piece of meteor that

doesn’t burn up. A meteor is a shooting star. Asteroids are sometimes called minor

planets.

CreditsCredits Pictures from clip art and Wikipedia.Pictures from clip art and Wikipedia.

Information from Scott Foresman Science. Information from Scott Foresman Science.

Asteroids by: ChIBU Nwafor & Landon HenryAsteroids by: ChIBU Nwafor & Landon Henry

Meteors, Meteorites, and Meteoroids by: Brooke Meteors, Meteorites, and Meteoroids by: Brooke Lord & Sarah Peirce.Lord & Sarah Peirce.

Comets by: Tate Hagan & Logan Campbell.Comets by: Tate Hagan & Logan Campbell.