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3

Consider you have a capsule with water at $T=300$ K. Water will start boiling right after you remove containing pressure. Evaporating water will take out the heat, required for phase transition into vapor, so remaining water will cool off. It will boil until it will reach $T_0=273$ K temperature. Then part of water will start to transit into ice. The remains ...


6

There is one excellent reason for putting a space telescope way out from the sun and that's because it's dark out there! No matter where you look, there's always a background sky level that limits the ultimate sensitivity of a telescope. Now even in the near-earth space environment the sky is markedly darker than it is for even the darkest ground-based ...


16

The disadvantages would likely outweight the advantages. It's cold out there. This makes it easier to keep an infra-red telescope cool The sun's just a super-bright star. This means more of the sky is visible and not in the glare of the sun. However you orbit so slowly that there will be a few objects that you won't be able to image because they are behind ...


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Things that are bound by other forces will not be seperated by the expansion of the Universe. For instance, planets do not expand due to cosmic expansion. The solar system does not either because it is held together by gravity. However, the space between galaxies or between galaxy clusters does expand.


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Think of the universe as a partially inflated balloon. If you decrease the air pressure of the air outside of the balloon then the balloon inflates. The density of the air in the balloon has just dropped because the mass is the same but it is taking up more space. The air molecules have spread farther away from each other but the molecules themselves don't ...


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