Light takes approximately one second to travel from the Earth to ...

[Jkov05]

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.

[smrtceo]

Answer to Question 1

C

Answer to Question 2

A

[Jkov05]

Excellent

[xiazhe]

TYSM