Light takes approximately one second to travel from the Earth to the Moon. This means that the Moon ...

Light takes approximately one second to travel from the Earth to the Moon. This means that the Moon is approximately
 
  A) 1 astronomical unit from the Earth.
  B) 300,000 kilometers from the Earth.
  C) 3,000 kilometers from the Earth.
  D) 1 light year from the Earth.
  E) twice the distance from the Earth to the Sun.

Question 2

Which of the following statements does not use the term light-year in an appropriate way?
 
  A) It will take me light-years to complete this homework assignment.
  B) It's about 4 light-years from here to Alpha Centauri.
  C) A light-year is about 10 trillion kilometers.
  D) It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year.
  E) The Milky Way Galaxy is about 100,000 light-years in diameter.

Question 3

The farthest bright galaxies that modern telescopes are capable of seeing are up to
 
  A) 10 billion light years away.
  B) 10 million light years away.
  C) 1 trillion light years away.
  D) 1 million light years away.
  E) 1 billion light years away.