1. A comet that passes by Earth has GPE, which will be all lost if it begins to fall towards Earth. If it's shot back up, it will now start with Ek and finish with a higher GPE. Now, what exactly is this GPE? if energy cannot be created or destroyed, but transformed, where does it get stored at GPE? Where does it go? Also, the comet would add the gravity of Earth as it hits Earth, thus increasing the GPE of everything else around Earth. Does this have anything to do with it?