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| any of various groups of stars to which definite names have been given and the section of the heavens occupied by such a group, such as Ursa Major, Andromeda |
| any of the nine large heavenly bodies revolving about the sun and shining by reflected light: a similar body revolving about a star other than the sun |
| Crab Nebula | |
| —n | |
| the expanding remnant of the supernova observed in 1054 | |