7(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust (6)
8Related by common characteristics or ancestry (6)
9(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed (4)
10Of a moderate purple colour (8)
11A giant planet with a ring of ice particles; the 8th planet from the sun (7)
13A set of eight similar things considered as a unit (5)
15(astronomy) the precise date that is the point of reference for which information (as coordinates of a celestial body) is referred (5)
16Impairment of normal physiological function affecting part or all of an organism (7)
18The second largest of Jupiter's satellites (8)
19The point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars (4)
21A man who is engaged to be married

(not really astronomy related, but I'm sure many astronomers have had one of these) (6)
22The 4th largest of Jupiter's satellites; covered with a smooth shell of frozen water (6)


1A circle of light around the sun or moon (4)
2The plane in which the disk of the Milky Way Galaxy lies (8,5)
3Dominance through threat of punishment and violence (7)
4Having the paleness of wax (5)
5Brightest star in Centaurus;

second nearest star to the sun (5,8)
6Revise or renew one's assessment (8)
12Intensity or forcefulness of expression (8)
14A low-altitude flight (usually of military aircraft) over spectators on the ground (7)
17Any of various willows having pliable twigs used in basketry and furniture (goodness knows what this has to do with astronomy) (5)
20Catch sight of (4)

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