3 Fat Chicks on a Diet has this, "Your weight on other planets" calculator that tells you what you weigh on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and the Moon.
You will weigh the lightest on Pluto, and the heaviest on Jupiter. You'll be 14lbs lighter on Venus.
What I found interesting is that the number range varies so much from planet to planet that it gets you really thinking about why we have so much attachment to a number on a scale.
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