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1

Yes, one could build very large structures in the upper atmosphere, but the economic advantages of such structures on Earth are not clear. The problem if launching into space is not that of providing "lift", the problem is to provide enough velocity. An air launch from a high flying plane only saves approx. 10% in total fuel due to atmospheric drag and ...

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The vast majority of the star like objects we see in the sky are stars in our own galaxy. Assuming the accelerated expansion is due to a cosmological constant, and assuming the value of the cosmological constant does change (it's currently of order $10^{-52}\,\text{m}^2$) the expansion will never be strong enough to disrupt the Milky Way. So our night sky is ...

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For an ideal balloon-pop (no interactions with the walls of the balloon) $dU = 0$. In the case of an ideal gas, $U = U(T) \propto NkT$. So the temperature, strictly speaking, does not change when the balloon expands. You end up with a gas at the same temperature but with a lower density.

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Really Are you Trying to move Sound in a Medium less Region . 1. Sound Require Medium to Travel So No chance If they Are Hearing Each Other . 2. IF there is Small Contact Then There will be Small Passing Of vibration and result in A little whisper to Both of them if they Shout Or whatever they Do. 3.as i said Transfer Of vibrations will be Small and Hence ...

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