What will happen if your twin returns from a trip in which he/she was traveling near the speed of light? What is the speed of light? If a ship is moving toward you at 2X10^8 m/s and it shines a light in your eyes, how fast does that light appear to be moving from your point of view? Translate E=mc^2 How could the entire mass of the universe have been the size of a softball on the day of the big bang? Is light a wave or a particle? What do we know about the escape velocity of a black hole?