131. 2022年9月28日 13:02:52 : iy7xtwKnug : aUwxY2RUTG1wVFE=[1]
Does Aether Exist g? (クリ)
Two spacecrafts are sailing from left to right in outer space. It is as far apart as Mars. Speeds are v and 2v. Two spacecraft flash at the same and long time interval. What is interval between the position of flashes on the celestial sphere as seen from the Earth ?
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題名には必ず「阿修羅さんへ」と記述してください。