Electromagnetic radiation, light, and the spectrum

Some basic facts about electromagnetic (EM) radiation:

  • All EM radiation travels the same speed in a vacuum. This speed is the speed of light (sometimes written as c), which is 3 x 10^8 m/s.
  • That means that light can travel around the Earth seven times in one second. That's fast!

    Nothing can go faster than light. Even Starfleet captains who, on TV, travel at "warp speed," must slow down here on Earth.

    http://www.ianhend.pwp.blueyonder.co.uk/ranger/star-trek-adventure.htm (I have never met these people)

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