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relativity

  • Einstein's idea about relativity might be called a theory, but that doesn't mean it's not true. (Wikimedia Commons)
    Can A Theory Evolve Into A Law?
    Walker Rhea
    Scientists get a little weary of some people saying that the fact that evolution is a theory means that modern science itself isn't convinced it really happens. Today we review the difference between a theory and a law.
  • When Buzz Aldrin went to the moon, he put down a two-foot-wide display of mirrors that faced Earth. (NASA, Wikimedia Commons)
    The Moon Is Getting New Mirrors
    Walker Rhea
    It's amazing how much light our moon reflects. Having a few mirrors doesn't hurt, though. They're there because of the Lunar Laser Ranging experiment.