/u/christianeralf's posts
If on planet Venus there was an intelligent civilization like humans on planet Earth, in the same stage of technological development, when and how would the contact between us and them have been? Was it by radio? Or spaceships? Or never?
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What is the relation between the formulas E=mc² and E=mv²/2 ? Are they related? Why the "/2" in the later?
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If we could put a satellite in a very fast and tight orbit around the sun, will it became a "time machine" because of time dilatation?
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