/u/hovissimo's posts in /r/askscience
Focusing sunlight can make a bright spot in mid-air (probably by illuminating dust), is it feasible that enough sunlight could heat the air such that the air itself radiates in the visible spectrum?
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Considering an Earth-sized magnetic field at Mars L1 (to shield Mars from solar wind, see recent headline), how much force would the solar wind exert on the spacecraft?
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