• Black Holes FAQs: What is a black hole? What would happen if you fell in one? What is a wormhole? And more...
  • Orbits in Strongly Curved Spacetime: This simulation shows the orbit of a low-mass test particle around a non-rotating black hole. See the effects of Einstein's theory of general relativity.
  • Bending Light in a Gravitational Field: Both a figure and a discussion show how gravity bends light, a feature which is especially prominent around very massive objects.