In principle, all objects warp spacetime. However, low-mass objects such as houses and trees warp spacetime to such a small extent that it's hard to notice their effects. It takes high-mass objects such as planets, moons, or stars in order for the gravitational effects to be noticeable. The more mass an object has, the more it warps spacetime, and the stronger its gravitational effect on other objects. For instance, a _________ has such a high amount of mass in such a small volume that even light cannot escape. Inside the event horizon of a __________, spacetime is so strongly warped that all possible paths that light can take eventually lead deeper into __________.