Planets – XKCD

Fantastic comic by xkcd, as usual. But the most interesting part is the hovertext:

Planets are turning out to be so common that to show all the planets in our galaxy, this chart would have to be nested in itself–with each planet replaced by a copy of the chart–at least three levels deep.

So, approximately how many planets in our galaxy?

2 thoughts on “Planets – XKCD

  1. There must be a poser size of this. Very cool. Have to spend some more time at xkcd. Can I get partial credit by answering your question with “a hell of a lot”?

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