short-period comet
Third-person singular simple present indicative form of pyramidize
plural of chloasma
Not sloped.
(astronomy) Any periodic comet with an orbital period of less than 200 years.
夏に、軌道周期が200年未満の周期彗星が地球に接近するときに予期せず明るくなり、観測者たちを驚かせた。
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