PD, A resumption of what? You originally said : “You can't be serious. Reducing your velocity while in orbit will reduce your altitude not raise it.” Using classical MS/Newton theory I showed that statement to be incorrect. Also showed that your “challenge” is false; the opposite is true. Perhaps your misunderstanding of MS beliefs is why you believe them ?? :-) Could it be that you think that because I can’t prove your false challenge to be true, it must be true? If so , enroll immediately in a logic 101 class… :-) RB BTW: I took BS to mean Brilliant Scientist . Robert B It's three days since my last post in an exchange between us which I thought to be showing good progress, but your abrupt cessation caused me to wonder. I've referred to that post and found an unfortunate error. Where I meant to type "[RB]" I've typed "[BS]" which could easily be interpreted as an unfortunate initialism. I don't know where my mind was (it should have still been reasonably active as the time was only 02h15 local) I can only attribute it to some dark Freudian Slip for which I must seek your forgivness -- it was definately not intended. Indeed -- why would I so foul the nest into which you had just laid such a beautiful egg? From Paul Deema Wed Jul 4 16:16:51 2007 [PD] Challenge - show that a one kilogram satellite in the higher orbit has less energy that the same satellite in the lower orbit. [BS] I cannot answer your challenge ….. because it’s incorrect. The higher orbit has more energy. Can I expect a resumption? Paul D