How long does it take for a star like our Sun to form? A) 100 ...

[strangeaffliction]

How long does it take for a star like our Sun to form?
 
  A) 100 thousand years
  B) Two million years
  C) Fifty million years
  D) One billion years
  E) 4.6 billion years

Question 2

What is the goal of comparative planetology?
 
  A) to use planetary positions to foretell the future
  B) to find which planets will be most suitable for future colonization
  C) to help plan future visits by unmanned probes, orbiters, and rovers
  D) to determine the origin and evolution of the solar system
  E) to find out how our own solar system compares with extrasolar ones

[LP]

Answer to Question 1

C

Answer to Question 2

D

[strangeaffliction]

Excellent

[adf223]

Gracias!