Earth reflects light from Sun into Space; are there any "mirror like" objects which reflect back to Earth this light? Has anyone been able to use this method to recover some information on how was the Earth in the past (how it looked, what was it temperature, etc)?
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cosmology - The difference between comoving and proper distances in defining the observable universe"The radius of the observable universe is estimated to be about 46.5 Gly." If I understand correctly, it means the most distant ob...
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Are C1, C2 and C3 connected in parallel, or C2, C3 in parallel and C1 in series with C23? Btw it appeared as a question in the basic physics...
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Everyone always talks about the efficiency of their appliances. I was wondering if everything was 100% efficient at heating its surroundings...
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