Gravity Assist

1. Using a gravity of a planet to travel faster in space
2. A tactic to defecate your excrement out of your butt when it stucks inside your anus (which cause gas or any uneasiness to your excretory system/intestines). By leaning on the toilet bowl lid while sitting, your excrement inside your anus will rush down and come out of your rectum due to the Earth gravity.

Gravity Assist will help you defecate easily.