Does the earth give of more weight (photons/molecules/whatever) than it
recieves or vice versa?
Either way, if the weight of the earth was changing then wouldn't it be
possible to make a system on earth that appeared to be in perpetual motion
if the loss/gain of the earths weight was greater than the loss/gain of the
system? I would imagine that the systems power would have to be extremely
weak and for all purposes and would obviously have to decrease the rate of
gain/change of the mass of the earth to work.

Dear Dan:

"Dan" wrote in message
...
Does the earth give of more weight (photons/molecules/
whatever) than it recieves or vice versa?

We have a net gain. Mostly from the Sun.

Either way, if the weight of the earth was changing
then wouldn't it be possible to make a system on
earth that appeared to be in perpetual motion

No. We have no way of coupling to infalling mass, to derive
energy from it. Other than heat of its passage through the
atmosphere.

David A. Smith