...... the current Earth is lighter than the Earth 100 years ago because humans built spaceships and satellites then sent them to the outer space....
arent we getting the occasional import from outer space? i mean its not a completely stagnant economy, we get an occasional meteor.
Not really. With the sheer amount of space debris falling down to Earth, it's probably gained a small amount of mass instead. Currently we've sent no more than 10 tonnes of matter out of our planet entirely. Even disregarding meteors and whatnot, heating and energy give mass through Einstein's equivalence E=mc^2. The Earth is actually gaining something like 40,000 tonnes each year from space debris and another couple hundred from temperature increases. The more you know >o<
How about the realization that the Earth days would actually lengthen in time because the moon's gravitational force is slowing down the earth's rotation even in a very small amount?
Earth mass is around ~6e24 kg. Severance thousands even millions of tons is not a big deal. It's like you have 6 Quadrillions dollars and gives someone on the road side a cent or a buck.
Most thing we sent into outer space went to LEO, which will return back to us in time. And as mentioned, meteors, asteroids and etc come down to earth. Things burning up in the atmosphere don't just magically disappear. That would violate the law of conservation of matter. It simply broke up into dust. So our mass is actually larger than it was 100 years ago.
Where are these spaceships you speak of? I don't recall any historical event of us building spaceships (not rocket or station) of such level of mobility and sturdiness. Am I missing something here, or am I ignorant of some deep underworld mystery or conspiracy concerning outer space?
Will you reply again with details if I do your chrysanthemum with a customized pile driver using the strongest metal on Earth? Hey, you said you wanted it, so let me do you a favor and grant you... your greatest pleasure. I shall ascend you unto heaven by my saving grace.