Jupiter radiates twice as much energy as it receives from solar ...

[tfester]

Jupiter radiates twice as much energy as it receives from solar light; the source of this excess energy is ________.
 
  Fill in the blank(s) with correct word

Question 2

For what reasons do we consider the planets of the solar system to be of two fundamentally different types?
 
  What will be an ideal response?

[meltdown117]

Answer to Question 1

gravitational contraction

Answer to Question 2

The jovian planets are made up mainly of the light elements, hydrogen and helium, while the terrestrial planets are made up mostly of heavier elements. The jovian planets are much larger, with faster rotations, and more moons than the terrestrial planets. These differences and others have led to a division of the planets into two main types.

[tfester]

Thanks for the timely response, appreciate it

[covalentbond]

TYSM