1. What makes up the Solar System and what force is holding it in place? The Force of Gravity hold our Solar System in Place. Things that make up our Solar System are the Sun, Planets, Asteroids, Comets, Meteorites, and Dwarf Plants

2. Name the 8 planets in order from closest to the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

3. Describe the main Features of the inner planets Closest to the Sun small, dense, solid, rocky planets

4. Describe the main features of the outer planets are all gas giants made mostly of hydrogen and helium. Their thick outer layers are gases and have liquid interiors All of the outer planets have lots of moons, as well as planetary rings made of dust and other particles

5. If the Sun were the size of a marble, describe how the rest of the planets would be and the space you would ned to build a model Solar System. The planets would be tiny if not microscopic. It would take approximately a playing field to build a model of this solar system.

6. What effect did the solar wind and heat from the newly formed sun have on the composition of the inner planets of the solar system? Solar Winds, push lighter elements out past the inner planets and have resulted in the formation of the Gas Giants.

7. Why do scientists think the outer planets have cores made from rock and a great deal of ice? The outer planets are to far from the Sun to have liquid water. Because of the makeup the Gas Giants the hythat the core of the outer planets are made of rocks and Ice.

8. Make a comparison of the Milky Way Galaxy and our Solar System: If the Milky Way was represented by 100,000 dollars out solar system would be 0.32 cents of that 100,000

9. Why would mars be the most likely voyage for manned exploration? Because it has an atmosphere similar to ours It is relatively close There is frozen liquid on its surface

10. Describe three important conditions on Earth that support life? Liquid Water Oxygen and atmosphere Organic material

11. List the steps of formation of the solar system from the nebular cloud. Describe how each step affected the composition (lighter and heavier elements) of the planets. 1. Gravitational collapse of the nebula Spinning disc and collection of matter in planets, denser matter towards center Ignition of the sun-blast of energy removes lighter elements from inner planets, melts heavier into rocky cores Collection of debris and gasses by outer planets.

12. What do Scientist use to determine the age of the Solar System? Radioactive decay, as elements decay they loose matter, as the energy in and atomic nucleus is reduced.

13. What do Scientist use to determine the age of the Solar System? Scientist graph the decay of radioactive elements and over many years have come to the conclusion that radiation is given off at a steady predictable rate.