渦巻銀河とX線連星系「M51-ULS-1」。（Source: Chandra X-Ray Observatory） はるか2800万光年離れた銀河に、土星サイズの惑星が潜んでいるらしいとする研究成果が10月25日、学術誌「Nature Astronomy」に発表された。確認されれば、これまで発見された中で最も遠くの惑星となる。 2800万年前、遠く離れた渦巻銀河で、青…
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