- - ... cloud, source of some comets (anagram of "root")
- - Dutch scientist with an eponymous 'cloud'
- - Jan Hendrik ......, Dutch astronomer who gave his name to a cloud of comets
- - Jan ........ has a very large cloud named after him
- - Dutch scientist for whom an astronomical 'cloud' is named
- - ...... cloud (source of comets)
- - Dutch astronomer who lent his name to a cloud
- - .... cloud: comet-filled region in interstellar space
- - .... cloud: remote solar system region
- - .... cloud: distant solar system region
- - Dutch astronomer for whom a cloud is named
- - Astronomical cloud's name
- - ...... cloud (solar system outlier)
- - Astronomy's ...... cloud
- - ...... cloud (region of comets far beyond Pluto)
- - ...... cloud (solar-system region)
- - Solar system's comet-intensive cloud
- - ...... cloud (astronomical sighting)
- - ...... cloud (distant part of the solar system)
- - .... cloud: solar system region beyond Pluto
- - ...... cloud (cosmic debris)
- - ...... cloud (comet-filled region of space)
- - ...... cloud (theoretical source of comets)
- - Kind of cloud
- - Cloud
- - jan .. [dutch astronomer b.1900 - d.1992]
- - Jan --, Dutch astronomer
- - Dutch astronomer Jan
- - Dutch astronomer who found the first evidence of dark matter
- - Comet astronomer, Jan Hendrik
- - Dutch astronomer
- - Comet astronomer
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