What is the one most astonishingly dumb things that, as a child, you believed was absolute truth?
I dont remember the age, but it was before Kindergarten, thought men came into the house at night to load the next days shows into the TV.
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Apart from the babies thing, that's still a very interesting question. I bet someone knows the answer, but I wonder if the weight of the earth increases or decreases on average. I'd have to guess it's a net increase from picking up stuff as we move through space, which probably dwarfs the mass of stuff we've sent out (especially if you don't count satellites since they're more or less still tied to earth). I don't think there's anything like natural ejections of matter from earth either.
If I recall correctly, it decreases. We lose more weight of atmospheric gas than we gain weight of meteorite material.
Additional external mass is additional mass. shrug