Explain your reasons), that it is seen as useful (and explain your reasons), that it is a complicated mix of both (in which case you should be careful to thoroughly explain both sides), or something else entirely.

The Earths rotation explains the motions of the stars over a day, but why does the sky change over many nights?

Particles that we can"t even make on Earth even in the most powerful atom smashers. We call this situation the primeval fireball. At this time, two opposing processes, pair production and annihilation took place. What must be conserved in these reactions?

10-24 grams. If the Sun consisted entirely of hydrogen atoms, how many atoms would it contain?

If we can detect light from a quasar and decide that its emission line spectrum is at redshift Z = 4, how much bigger has the universe grown since that light left? A. B. C.

ANSWER: _________________ 7. If half-million asteroids, each 1km in diameter, were assembled into one body, how large would it be?

Away from us faster than nearby ones Hubble"s law: V=H0 x d What does this Mean?

"If the Earth rotated twice as quickly as it does now, what would be the difference in minutes between the solar and sidereal days? Explain how you got your answer."

How does the overall length of the Cassegrain telescope design compare with that of the Newtonian style? _________________________________________________ Can you come up with one or more reasons why the Cassegrain design might have advantages over the Newtonian? Why does the hole in the...

Use this technique to answer the following questions: 1. What time of day does the 1st quarter moon rise?