Briefly explain why Mercury, Venus, and the Moon do not have ...

[sammy]

Briefly explain why Mercury, Venus, and the Moon do not have significant erosion. Relate erosional activity to planetary size and distance from the Sun.
 
  What will be an ideal response?

Question 2

How many times must a dip in the brightness of a star be seen in order to detect a planet with the transit technique?
 
  A) 1 time B) 2 times C) 3 times D) 4 times

[dudman123]

Answer to Question 1

Both Mercury and the Moon have negligible atmospheres from the point of view of erosion. Their relatively small size led to only a small amount of outgassing to form an atmosphere in the first place, and made them unable to retain any atmosphere they did outgas. Venus has a great deal of atmosphere but very little erosion. Water erosion doesn't occur because the planet is too hot, related to its distance from the Sun. It lacks significant wind erosion because its slow rotation rate leads to very slow winds.

Answer to Question 2

C

[sammy]

Thanks

[dudman123]

Welcome