I want aliens to come to earth.

It’s going to be a very long time (if ever) that we go traipsing around the galaxy visiting others. If we do, of course we’ll be the aliens (which has made for some good SF stories and a recent cute film). Our tech is a long way from a galactic bus, so that’s one thing. Another thing is that we have no idea where to go. So far SETI hasn’t SEEN; for all we know we’re alone in the local universe.

You may have heard of the Drake Equation, which starts with the huge number of stars and calculates that even if a fraction of a fraction of a fraction (and so on, several times) of them have the conditions necessary, there are still many possible worlds with intelligent life.

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