"Alpha Centauri is 4.3 light-years away ... "If this all works right, we can hold the beam together in space a very long ...

Free-space optical communication, or FSO, is an interesting and easy way to transmit signals through light beams. Forget expensive lasers or commercial-grade equipment; this video by [W1VLF ...

An art installation featuring 30 laser beams in primary colors will shine from the top of the Space Needle Friday night.

Wouldn't the adjacent beam of light appear motionless? Maxwell's equations didn't seem to allow light to slow down or stop when moving through space. Einstein's answer—that light's speed is ...

At 16, he imagined what it would be like to chase, catch up with, and ride on a light beam. When he started thinking ... like the vast emptiness of space. Here on Earth, the speed of light can ...

Light travels across space, but what about sound ... They pick up scientific data about our Universe and beam it back to Earth. Some probes orbit and land on different planets.