短周期彗星 ; 短期彗星
But there are about 1000 so-called short-period comets, whose orbits take less than 200 years.
ECONOMIST: Unbuckling the Kuiper belt
Short-period comets, however, are mostly confined to the ecliptic the plane in which the planets themselves are found.
Short-period comets have their short periods precisely because of their interactions with closer-by planets, which are already known to astronomers.
ECONOMIST: X marks the spot
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