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Author Question: Ganymede and Callisto have densities suggesting they are made of rocky cores and mantles of A) ... (Read 80 times)

Zoey63294

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on: Jul 27, 2018
Ganymede and Callisto have densities suggesting they are made of rocky cores and mantles of
 
  A) hydrogen.
  B) iron.
  C) liquid methane.
  D) ammonia ice.
  E) water or ice.

Question 2

Contrast the sidereal and solar days.
 
  What will be an ideal response?


atrochim

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Reply #1 on: Jul 27, 2018
Answer to Question 1

E

Answer to Question 2

The Earth rotates once on its axis every 23 hours, 56 minutes, and thus turns to face the same distant star in that interval. But we are also revolving around the Sun at one degree eastward per day, hence the Sun appears to have moved eastward from one day to the next, and it takes a full 24 hours to align with the Sun again.


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