Chapter 24: Section 1 (Our Solar System)


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Chapter 24
Section 1: Our Solar System
8th Grade General Science
Minersville Area School District
Mr. Motuk

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Chapter 24: Section 1 (Our Solar System)

  1. 1. Chapter 24<br />Section 1: Our Solar System<br />
  2. 2. Pgs. 639 - 645<br />24:1 The Solar System<br />A. From Earth, other planets are just dots of light<br />Tend to be mistaken for stars<br />Telescopes & space probes revealed so much more<br />B. Early Ideas about the Solar System<br />Earth Center Theory:<br />Early Greeks believed Earth was the Center of the Universe<br />All objects were imbedded in circular paths around us<br />Their order of the universe:<br />Earth Moon Sun Mercury Venus Mars Jupiter Saturn Stars<br />
  3. 3. Chapter 24: Section 1<br />Heliocentric Model<br />1543: Nicholas Copernicus (Polish Astronomer)<br /> Proposed a series of different views:<br />The Earth is a planet<br />The moon revolves around the Earth<br />Planets revolve around the Sun<br />The apparent movement of the sun & planets is due to Earth rotating on it’s axis<br />
  4. 4. Chapter 24: Section 1<br />Heliocentric Model (continued)<br />Galileo Galilei supported Copernicus<br />Showed Venus goes through phases just like the moon<br />Only possible if Venus orbits the sun <br />
  5. 5. D. Modern View of the Solar System<br />10 Planets revolve around our Sun<br />Mercury, Venus, Earth, Mars<br />Asteroid belt (separates inner & outer Planets)<br />Jupiter, Saturn, Uranus, Neptune, Pluto, Xena<br />Most planets have at least one moon orbiting them<br />The sun contains99.86 %of all solar system mass<br />Gravity controls motion and orbital paths<br />
  6. 6. Chapter 24: Section 1<br />Formation of the solar System<br />5 b.y.a. large cloud of gas, ice & dust existed<br />Began to contract & slowly rotate<br />a. Contraction increased density & rotation<br />b. Gravity began to pull material toward the center<br />c. Density increases = increased rotation & gravity<br />d. Begins to form disk with large center<br />
  7. 7. Chapter 24: Section 1<br />Formation of the solar System<br />2. Began to contract & slowly rotate (continued)<br />e. Central mass begins to heat up due to contraction<br />Temperatures reach 10 million 0C<br />Hydrogen atoms begin to fuse together forming Helium<br />Fusion occurs, driving the formation of our Sun<br />f. The material outside the central mass forms planets<br />g. This is known as the BIG BANG THEORY<br />
  8. 8.
  9. 9. The Parts of Our Solar System<br />Parts of Our Solar System<br />Inner Planets:First four planets<br />a. Solid, rock like structures<br />Asteroid belt:band of rocks orbiting the sun<br />Outer Planets:Six planets farthest from the sun<br />a. 4 are made up of mainly lighter element gases<br />Last two are frozen materials<br />The sun is the center of Our Solar System!!<br />
  10. 10. Chapter 24: Section 1<br />Motion of the Planets<br />Johannes Keplerstudied planetary orbits<br />a. Discovered orbits areelliptical <br />Farther from the sun, larger the ellipse<br />Realized the Sun is not exactly central in our solar system<br />b. Planets travel at different speeds through their orbit<br />Planets closer to the sun move faster<br />Planets change speed during their orbit as well<br />