Gravitational phenomena refer to the effects and behaviors caused by gravity, the force that attracts two bodies toward each other. This force is responsible for keeping planets, like Earth, in orbit around the Sun and governs the motion of objects on the surface of Earth. One notable gravitational phenomenon is black holes, regions in space where gravity is so strong that nothing, not even light, can escape. Another example is the tides on Earth, which are influenced by the gravitational pull of the Moon and Sun, causing the regular rise and fall of ocean levels.