This article was originally published with the title “ The Michelson-Morley Experiment ” in Scientific American Magazine Vol. 211 No. 5 (November 1964), p. 107 doi:10.1038 ...

IT seems to have been implied, in recent discussions, that the Stokes-Planck ether theory, while correlating the facts of astronomical aberration and other first order phenomena having to do with ...

We are at a critical time and supporting climate journalism is more important than ever. Science News and our parent organization, the Society for Science, need your help to strengthen ...

On one hand, the speed of light is just a number: 299,792,458 meters per second. And on the other, it's one of the most ...