a. How big is the universe?
b. How long ago was the universe created?
c. What theory do scientists use to explain how the universe was created?
d. Why did the things that we heard get older as we got farther away from planet Earth?
e. What are those signals? (electromagnetic waves)
2. As an additional activity, you could discuss the Big Bang Theory. This clip can also be used as part of a discussion on gravity and Newton's first law of motion. It is gravity that holds the planets in orbit around the sun. The Big Bang theory is partially based on the fact that the universe is expanding. According to Newton's first law, an object in motion stays in motion until acted on by an outside force. When the universe was created, matter was put into motion and continues to stay in motion today.