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1866 in science : ウィキペディア英語版 | 1866 in science
The year 1866 in science and technology involved some significant events, listed below. ==Astronomy==
* May – William Huggins studies the emission spectrum of a nova and discovers that it is surrounded by a cloud of hydrogen.〔 〕 * June 4 – Pluto (not known at this time) reaches its only aphelion between 1618 and 2113. * Giovanni Schiaparelli realizes that meteor streams occur when the Earth passes through the orbit of a comet that has left debris along its path.
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