NASA responsible for Global Warming..

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Before I discuss this let me tell you it is just a JOKE. So please don't lift those arms and come to kill me. So we ...a couple of friends..strayed into finding reasons for global warming and one of them said NASA is responsible. According to him, when we send the space ships out, we lose a loss of weight, and that increases the gravitational pull that the sun exerts over our dear earth. And our orbit becomes a few kilometers shorter bringing us closer to sun, and closer to Venus..which is hot. So he is of the opinion that meteors striking earth and staying put here prevent such thing. As usual I did not agree...I felt centrifugal force should be working pushing the earth outwards and if at all, we are warmer because it is Jupiter's gravitational pull we are experiencing now. In either case, NASA became the scapegoat. I know it was just a fun talk but afterwards when I thought about it I found reasoning there. Problem is, I don't know which of us is right, because both sides of the argument seem to be ok. Have you ever faced a situation in which both sides of the argument seem reasonable, and you are forced to think more and some more till you are convinced that only one of the two situations is correct.