Can anybody direct me to a discussion on the effects of a sudden reduction of the earth's gravity - say by 50%? Purely speculative, of course. I'm assuming its orbit around the sun would be essentially unchanged, but that the moon would recede or maybe head off on its own merry way. Any other musings on air pressure, human survival, sea level, etc also welcomed. Oh, and it goes without saying that I am lazy, stupid and posting in the wrong forum.