Describe some characteristics that all the planets seem to share ...

[tnt_battle]

Describe some characteristics that all the planets seem to share and use the solar nebula theory to explain them.
 
  What will be an ideal response?

Question 2

How does the solar nebula theory account for the presence of comets?
 
  What will be an ideal response?

[tkempin]

Answer to Question 1

All planets orbit in nearly the same plane, with a common direction of rotation and revolution. This can be explained by the solar nebula theory, which says that the planets were formed from a rotating disk of gas and dust around the young Sun.

Answer to Question 2

Comets are understood to be left over from the origin of the planets.