1. 1. _____first person to use a telescope to view the sky 2. _____sun centered theory of the solar system 3. _____ Earth centered theory of solar system 4. _____air mass that blows into Georgia from the southeast 5. _____ 2 nd most abundant gas in the atmosphere RAP

2. Key Questions 1. What is the Big Bang Theory? 2. What is the universe? 3. What is expanding? 4. What is dense? 5. What is a solar system? 6. What is a nebula? 7. How was the solar system formed?

3. 1. Big Bang Theory-a large, dense massive ball of gases exploded and the universe began and started expanding 1. Big Bang Theory-a large, dense massive ball of gases exploded and the universe began and started expanding 2. Universe-contains galaxies, stars, solar systems, planets, moons, dust, gas, energy, comets, space rocks 2. Universe-contains galaxies, stars, solar systems, planets, moons, dust, gas, energy, comets, space rocks 3. Expanding-getting larger 3. Expanding-getting larger 4. Dense-closely packed together 4. Dense-closely packed together 5. Solar system-composed of the sun (a star), planets, moons, comets, and asteroids 5. Solar system-composed of the sun (a star), planets, moons, comets, and asteroids 6. Nebula-a gigantic cloud of gas and dust 6. Nebula-a gigantic cloud of gas and dust 7. 4. 5 Billion years ago and drawing 7. 4. 5 Billion years ago and drawing