NASA's LLCD Tests Confirm Laser Communication Capabilities In Space 107
An anonymous reader writes "This week, NASA released the results of its Lunar Laser Communication Demonstration's (LLCD) 30-day test carried out by its Lunar Atmosphere and Dust Environment Explorer (LADEE) that is currently in orbit around the Moon. According to the space agency, the LLCD mission proved that laser communications are practical at a distance of a quarter of a million miles and that such a system could perform as well, if not better, than any NASA radio system."
Re:SETI (Score:2, Informative)
A great example of this that I've seen is: Shine a spotlight at the moon (from Earth) and sweep it across the surface. You can move the spot faster than the speed of light, thus the wave moves faster than c, but no individual photon moves faster than c, and no information is conveyed faster than c.