Screwdriver
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As for "flying" in a weightless environment, it's a trick question which does not clearly define the problem. @PhillipM is bang on when he asks for a definition of "flying". Are you "flying" above "the ground"? What ground?
If it's way more theoretical and you're in a weightless environment somehow surrounded by a dense gas (an atmosphere is defined as the gas surrounding a large gravitationally significant body like a planet or star) then you are still playing with the semantic meaning of "fly". The aircraft will move relative to an arbitrary point defined by the gas cloud but in some sense, it will also shift the cloud relative to some other "fixed" point in space.
It is tempting to imagine "flying" though the gaseous "cloud" of a nebula. Unfortunately, that probably doesn't constitute either an atmosphere or a dense gas field since you'll only be able to grab onto a few hundred/thousand particles or molecules per cubic cm compared to say a billionbillion down here on earth.
Will it move? Yes. Is that "flying"? No.
If it's way more theoretical and you're in a weightless environment somehow surrounded by a dense gas (an atmosphere is defined as the gas surrounding a large gravitationally significant body like a planet or star) then you are still playing with the semantic meaning of "fly". The aircraft will move relative to an arbitrary point defined by the gas cloud but in some sense, it will also shift the cloud relative to some other "fixed" point in space.
It is tempting to imagine "flying" though the gaseous "cloud" of a nebula. Unfortunately, that probably doesn't constitute either an atmosphere or a dense gas field since you'll only be able to grab onto a few hundred/thousand particles or molecules per cubic cm compared to say a billionbillion down here on earth.
Will it move? Yes. Is that "flying"? No.