"Roemer was able to calculate a value for the speed of light. The number he came up with was about 186,000 miles per second, or 300,000 kilometers per second." (http://www.colorado.edu/physics/2000/index.plthe ) This was from the measurement taken from Jupiter and its revolving partner Io. It...
In "Frozen Light" an article written by Lene Vestegaard Hau, it talks about Lene's experiments with, literally, slowing down light by way of passing it through "ultra-cold clouds of atoms." The experiment was undertaken at Cambridge and Lene and a group of researchers were able to get light's...