1. Bell ringer (write the questions)
Arrange the following list of objects found in space from largest to smallest: solar system, moon, universe, planet, Sun, galaxy.
Compare and Contrast: terrestrial planets and gas giants.
List the planets in order as you move away from the sun. Start the list with the Sun. Circle the terrestrial planets. SQUARE the gas giants.

2. Formation and development of stars
All stars start off as a nebula
A contracting cloud of gas and dust with enough mass to form a star is called a protostar
Nebula

3. What unit of measure do we use to measure the solar system?
Distances between objects in the solar system are so large that they are not easy to measure using m or Km.
Astronomical Unit
One astronomical unit = the average distance measured from the center of the sun to the center of earth about 150,000,000 Kilometers.

4. What unit of measure do we use to measure Galaxies?
Distances to stars are so large that meters are not practical.
Light year
The distance that light travels in one year.
About 9.46 trillion kilometers

5. SC.8.5.3
Distinguish the hierarchical relationships b/t planets & other astronomical bodies relative to solar system, galaxy & Universe, including distance, size & composition

6. Bell ringer Complete the following star formation timeline :
Nebula ____________ Star
2. What do scientist look at in order to differentiate stars?
3. What in an astronomical unit? When do scientist use this unit of measure?
4. When do scientist use light years as a unit of measurements?

7. The Sun Composed mostly of Hydrogen (75%) & helium (25%)
4.6 Billion years old
Surface temperature = 5,500 degrees Cel.
Core Temperature = 15,000,000 degrees Cel.

8. Structure of the SUN Corona: atmosphere Photosphere: visible surface
Chromosphere: middle layer
Convective Zone: convection
Radiative Zone: Radiation
Core: Nuclear fusion
This Photo by Unknown Author is licensed under CC BY-SA

9. The SUN’s ENERGY
Nuclear Fusion: When 2 or more atoms fuse to form another atom.
In the Sun’s core
The Sun’s Fuel : 2 hydrogen atoms become 1 helium atom
Using Einstein’s formula, scientists are able to explain how the Sun produces so much energy

10. The Sun’s Energy Energy is Transferred to the Sun’s surface
Radiation Waves in the Radiative Zone
Convection in the Convection Zone

11. Sun’s ROTATION
This Photo by Unknown Author is licensed under CC BY-SA

12. SOLAR ACTIVITY
Sun Spots: dark areas that are cooler than the area surrounding them
Solar Flares: Explosions that extend outward
Prominences: Explosions the loop out and return to the Sun’s surface