Have you wondered, how deep down the gravity well are we in? Me neither. But this xkcd comic let us know:
It turns out it is a really good picture of what a “gravity well” is, which has to do with the amount of speed, thereby energy needed to climb out of the well and prevent yourself from clawing at the wall and falling. Now you know how come you need a giant rocket to get out of this really deep well we call Earth. Of course, compared to the giant planets and the gargantuan sun, Earth’s well is nothing. Falling into Jupiter must make one heck of a nasty experience…
