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发帖数: 298 | 1 从www.space.com的一篇文章上cut一段：）
Ancient visitor returns
Soon after a preliminary orbit was calculated for Ikeya-Zhang, some orbital
experts, lead by Syuichi Nakano of Japan, noticed a similarity to a pair of
much earlier comets that appeared in 1532 and 1661.
The 1532 comet, in particular, was a strikingly bright comet, according to
Oriental records. Curiously, during the first week or two that Ikeya-Zhang
was under careful scrutiny by observers worldwide it appeared to be brightening
at an unusuall |
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