Transcript
Page 1: Chapter 24:  Section 4 (Other Objects in our Solar System)

Chapter 24Chapter 24Section 4: Other Objects in SpaceSection 4: Other Objects in Space

Page 2: Chapter 24:  Section 4 (Other Objects in our Solar System)

Chapter 24: Section 4Chapter 24: Section 4A.A. Comets:Comets:

1. Controlled by a star’s gravity1. Controlled by a star’s gravity

2.2.Travel through planets’ orbits, out Travel through planets’ orbits, out of the Solar System, & back in of the Solar System, & back in againagain

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Halley’s CometHale-Bopp Comet

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Chapter 24: Section 4Chapter 24: Section 4A.A. Comets:Comets:

3.3. HALLEY’S COMET:HALLEY’S COMET: Most famous (last seen Most famous (last seen 1986)1986)

a.a. Returns every 76 yearsReturns every 76 years

b.b. Will return in 2062Will return in 2062

4.4. HALE-BOPP:HALE-BOPP: Most recent cometMost recent comet

a.a. Discovered in July 23, 1995Discovered in July 23, 1995

b.b. Visible from Earth during 1997Visible from Earth during 1997

Pgs. 662 - 666

Halley’s CometHale-Bopp Comet

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Chapter 24:Section 4Chapter 24:Section 4

B.B. Comet Composition: Comet Composition: 1.1. Dust, rock, frozen methane, ammonia, and waterDust, rock, frozen methane, ammonia, and water

2.2. Comets normally look like dirty snowballsComets normally look like dirty snowballs

3.3. When they get close to stars, they changeWhen they get close to stars, they change

a.a. They begin to vaporize & GlowThey begin to vaporize & Glow

b.b. Forms aForms a comacoma (tail) from the(tail) from the nucleusnucleus (head)(head)

1.1.Coma:Coma: glowing trail of particles glowing trail of particles

2.2.Always points away from the starAlways points away from the star

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Chapter 24: Section 4Chapter 24: Section 4

B.B. Comet Composition (cont’d)Comet Composition (cont’d)

4.4. Comets eventually break up into Comets eventually break up into space debrisspace debris

5.5. Oort Cloud:Oort Cloud: large collection of comets large collection of comets beyond Plutobeyond Pluto

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Chapter 24: Section 4Chapter 24: Section 4

C. Meteoroids:C. Meteoroids: chunks of rockchunks of rock

1.1. Randomly moving through spaceRandomly moving through space

2.2. Usually leftover comet or asteroid debrisUsually leftover comet or asteroid debris

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Chapter 24: Section 4Chapter 24: Section 4

D.D. Meteor:Meteor: Meteoroid that enters Earth’s Meteoroid that enters Earth’s atmosphereatmosphere

1.1. Heat up & begin to glow = shooting starHeat up & begin to glow = shooting star

2.2. Most burn up before reaching the surfaceMost burn up before reaching the surface

3.3. Many meteors at one time = meteor Many meteors at one time = meteor showershower

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Chapter 24: Section 4Chapter 24: Section 4

E.E. Meteorite:Meteorite: Meteor that does not Meteor that does not totally burn up, & strikes the Earth’s totally burn up, & strikes the Earth’s surfacesurface

1.1. Impact creates a craterImpact creates a crater

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LARGEST METEORITE TO HIT LARGEST METEORITE TO HIT EARTH – Namibia, AfricaEARTH – Namibia, Africa

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Largest US Meteorite – Kansas Largest US Meteorite – Kansas under 6 feet of earth.under 6 feet of earth.

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Chapter 24: Section 4Chapter 24: Section 4F. AsteroidsF. Asteroids

1.1.Large rocks located between Mars & Large rocks located between Mars & JupiterJupiter

2.2.Asteroid belt: Large orbiting ring of Asteroid belt: Large orbiting ring of asteroidsasteroids

3.3.Believed to be a planet that never Believed to be a planet that never formedformed

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Chapter 24: Section 4Chapter 24: Section 44.4.Range in size from dust to Moon sizeRange in size from dust to Moon size

5.5.Some Named Asteroids:Some Named Asteroids:

a.a.Ceres: 940 km (Largest known)Ceres: 940 km (Largest known)

b.b.Pallas: 523 kmPallas: 523 km

c.c. Vesta: 501 kmVesta: 501 km

d.d.Juno: 244 kmJuno: 244 km

e.e.Gaspra & Ida: Gaspra & Ida:

f.f. Photographed by Galileo probePhotographed by Galileo probe

g.g.Ida even has a smaller asteroid Ida even has a smaller asteroid orbiting itorbiting it


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