What's the best explanation for the location of hot jupiters?

The air that we breath is made mostly of which gaseous molecule

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

Ascientific blank must be testable and capable of being proven false?