3 ms·

Wow, I've never considered such a thing before. Can this be used for anything?

• Semiapies 12y ago
  Sadly, no. Imagine an immense wall light-years wide and a light-year or so away from you. If you have a (really!) bright laser pointing at it, you can wiggle around the dot so that the dot moves at FTL speeds. But, there'll be at least a year's lag from your wiggle to the dot moving (and another year before you can see the dot move), so you can't use it for signaling faster-than-light or anything like that.
  • ezpuzzle 12y ago
    unless there's an alien with another laser pointer on the other side ;)