1. What is the name of the hypothesis for the formation of the solar system? Describe this hypothesis.
2. List the planets, from hottest to coolest, based on the temperature at their location in the early solar system at the time of formation.
3. Which planets formed where the temperature during the formation of the solar system was below the freezing point of water?
4. Which planets formed where the temperature during the formation of the solar system was above the boiling point of water?
5. Circle the correct statements from the italicized choices:

Close to the Sun, temperatures during planet formation wereabove boiling / below freezingand planets began to grow from the solidrock / metal / ice(circle all the apply) that was in the region. These planet grewquickly / slowly. Far from the Sun, temperatures during planet formation wereabove boiling / below freezingand planets began to grow from the solidrock / metal / ice(circle all the apply) that was in the region. These planet grewquickly / slowly. Because they grew more quickly, the planetsclose to / far fromthe Sun got big enough to hold onto and accumulate a lot of gas and so became theJovian / Terrestrialplanets. The planets that grew more slowly were not able to hold onto and accumulate a lot of gas, and these became theJovian / Terrestrialplanets.

The graph below illustrates the temperature at different distances from the sun during the formation of the solar system. A line for a different solar system (red line) is also shown.

2000 Mercury 1000 Venus Earth .Mars 500 Temperature (kelvin) 200 Jupiter Saturn 100 Uranus 50 Neptune 20 0.1 0.2 0.5 1.0 2.0 5.0 10 20 50 Distance from the Sun (AU)