Final answer:
According to general relativity, mass distorts spacetime, gravity affects clocks, and light cannot escape from a black hole.
Step-by-step explanation:
According to the general theory of relativity, mass distorts spacetime and gravity affects clocks. Additionally, light cannot escape from a black hole. General relativity states that the presence of mass or energy in a certain space distorts or curves spacetime around it, causing objects in the vicinity to move differently due to the curved space-time. This distortion affects light as well, preventing it from escaping a black hole's gravitational pull.