Which method relies on the mass of a dark object revealing its ...

[K@]

Which method relies on the mass of a dark object revealing its presence?
 
  A) pulsars slowing down irregularly
  B) temporary brightening of a distant star by a gravity lens
  C) asteroidal occultations
  D) stellar eclipses
  E) ring occultations

Question 2

Relate Mercury's scarps to the differentiation process.
 
  What will be an ideal response?

[JaynaD87]

Answer to Question 1

B

Answer to Question 2

As Mercury was molten, the dense iron core formed from sinking iron and nickel. But smaller Mercury cooled off much faster than Earth, so its core cooled and started shrinking as it froze solid. This contraction caused the crust above to wrinkle and form the vast scarps that run across Mercury's crust.

[K@]

Great answer, keep it coming

[sailorcrescent]

Thanks for the timely response, appreciate it