The stars found in nebulae like the Orion Nebula probably formed:

The stars found in nebulae like the Orion Nebula probably formed:
 
  A) a few million years ago.
  B) about 10 million years ago.
  C) hundreds of millions of years ago.
  D) billions of years ago.
  E) at the beginning of the universe.

Question 2

Long period comets are thought to reside mainly in the:
 
  A) asteroid belt.
  B) Kirkwood gaps.
  C) Kuiper Belt.
  D) Oort Cloud.
  E) Interstellar Medium.

Question 3

Molecular clouds appear more transparent at longer wavelengths.
 
  Indicate whether the statement is true or false

Question 4

The following statements are all true. Which one counts as an exception to the rule in being unusual for our solar system?
 
  A) Venus does not have a moon.
  B) Jupiter has a very small axis tilt.
  C) Saturn has no solid surface.
  D) The diameter of Earth's Moon is about 1/4 that of Earth.