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There are 66 clues with the answer 'OORT'
# CLUE
1.
___ cloud: remote solar system region
2.
___ cloud: distant solar system region
3.
Dutch scientist for whom an astronomical "cloud" is named
4.
Solar system's comet-intensive cloud
5.
__ cloud: solar system region beyond Pluto
6.
___ cloud (solar system outlier)
7.
___ cloud (region of comets far beyond Pluto)
8.
__ cloud (theoretical source of comets)
9.
Frozen comet nuclei orbiting the solar system; _ cloud (4)
10.
Astronomer who proposed the existence of a cloud of frozen comet nuclei beyond the Kuiper Belt (4)
11.
___ cloud (comet's home)
12.
Astronomer who proposed the existence of an immense cloud of icy comets and matter leftover from the solar system's formation some 4.5 billion years ago (4)
13.
___ cloud: comet-filled region in interstellar space
14.
Name of the giant theoretical cloud where long-period comets are believed to originate (4)
15.
Dutch astronomer who first postulated the existence of a cloud in the most distant region of the solar system where long-period comets are thought to originate (4)
16.
Jan --, Dutch astronomer (4)
17.
Jan -; Dutch astronomer who proposed the existence of a theorised shell of icy objects existing beyond the Kuiper Belt (4)
18.
Jan ____ has a very large cloud named after him
19.
___ cloud, as in Astronomy
20.
___ cloud
21.
___ cloud, in Astronomy
22.
Astronomer captivated by Pluto or thereabouts
23.
Eponym of a space "cloud"
24.
Dutch astronomer, Jan ___ (b.1900 - d.1992)
25.
___ cloud, as per Astronomy
26.
Dutch astronomer Jan -
27.
__ cloud: comet-filled region in interstellar space
28.
__ cloud: remote solar system region
29.
Dutch astronomer, Jan ___ (b.1900 d.1992)
30.
Certain cloud