1. Solar System
Expectations: D2.1, D2.4, D2.5, D3.3

3. The Solar System
Consists of the Sun, eight planets and their moons and billions of celestial objects.
Planets:
must orbit a star
have enough mass to be pulled into a stable sphere shape by gravity
dominate its orbit (Pluto does not dominate its orbit! Dwarf planet)

4. Inner Planets

5. Outer Planets

6. The Sun

7. Asteroids
Small celestial objects in the Solar System composed of rock and metal.
Vary in size and shape
The asteroid belt lies between Mars and Jupiter.
Ceres  1st discovered

8. Meteoroids
Piece of metal or rock smaller than an asteroid. (dust to size of a car or building)
If they get pulled into Earth’s atmosphere, they will burn up (friction), it is then called a meteor. Commonly called a “shooting star.”
If it reaches Earth it is called a meteorite.

9. Arizona impact crater

10. Meteorite

11. Comets Large chunks of ice, dust and rock that orbit the Sun.
Forms a gas tail that points directly away from the Sun
A dust tail forms in the direction from which the comet came.
Orbit the sun on elliptical paths
“dirty snowballs”
Eg. Halley’s comet (pass in 2061)

12. Comet

13. Homework
Page 317 # 5, 6, 9
Planet Survey (p319 & old text p [Science Power 9])
Sketch of the solar system. Label the:
Sun
Planets & Pluto
Asteroid Belt
Inner & Outer Planet