Suppose the jovian planet atmospheres were composed 100 percent ...

[Jramos095]

Suppose the jovian planet atmospheres were composed 100 percent of hydrogen and helium rather than 98 percent of hydrogen and helium. How would the atmospheres be different in terms of color and weather?
 
  What will be an ideal response?

Question 2

At what point does the accretion process turn a clump of debris into a planetesimal?
 
  What will be an ideal response?

[janeli]

Answer to Question 1

Without ingredients besides hydrogen and helium, the jovian planets would all be gray in color, and there would be no clouds or precipitation.

Answer to Question 2

When its gravity and mass are sufficient to pull on neighboring debris.

[Jramos095]

Both answers were spot on, thank you once again

[janeli]

Great! Please up vote