Exactly. The trick is in realizing that gravity affects everything, including light, and not just physical objects as intuition might suggest. See also: The Mus

Exactly. The trick is in realizing that gravity affects everything, including light, and not just physical objects as intuition might suggest. See also: The Museum of Unworkable Devices [ http://www.lhup.edu/~dsimanek/museum/unwork.htm http://www.lhup.edu/~dsimanek/museum/unwork.htm ] for exercises.