小惑星(Sió-hi̍k-tshenn)是佇咱太陽系日頭的細的物件,小惑星是一款細粒惑星(minor planet);(人因)並惑星加足細的。一般認為小惑星較濟是古早惑星形成的時陣賰落來的原惑星盤 (protoplanetary disc)的幼仔成份,大部份的小惑星踮主要的小惑星帶有底揣。

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