《英文msh词典》Comet (Astronomy)
[入口词] Comet (Astronomy)
[主题词] Meteoroids
[英文释义] Any solid objects moving in interplanetary space that are smaller than a planet or asteroid but larger than a molecule. Meteorites are any meteoroid that has fallen to a planetary surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms,4th ed)