discussion questions - eclipses, lunar phase changes, Newton - b. Explain what causes a lunar eclipse. Explain what causes a solar eclipse. Include a diagram. Why don't eclipses occur every month? c. Describe the phase changes of the Earth that one would see if viewed from the Moon. f. It is said that Newton unified Earth and the Universe. Explain.

discussion questions - a. Explain how the age of rocks can be determined by radioactivity. Give an example. b. How can scientists determine the internal structure of the Earth, if the depth of the deepest well is only a tiny fraction of the earth's diameter?

An explanation on how satellites are put into orbit. - Explain how an object is put into orbit about the Earth (to become a satellite)? Include the relationship between gravity and velocity.

discussion questions - f. Which is hotter, Mercury or Venus? Why? h. Explain why there are two general families of planets, rocky terrestrial and gaseous jovian. j. What knowledge do comets and asteroids provide to studies of the origin of the solar system?

Discussion questions - n. Evidence is strong that the formation of the Sun (and its family of planets) happened by the same processes as the formation of stars. Explain. o. How are planets detected around other stars? p. Did the Sun and solar system form in the first half or last half of our galaxy's history? Explain. (Please reply in your own words, if possible)