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There are 15 clues with the answer 'OORTCLOUD'
# CLUE
1.
Probable source of most long-period comets
2.
Could root out source of comets (4,5)
3.
Could root out the origin of comets
4.
Could root out the origin of comets (4,5)
5.
Theoretical spherical region of icy planetesimals beyond the Kuiper Belt (4,5)
6.
Change to our cold deep-space orbiters?
7.
Giant shell of frozen comet nuclei theorised to envelop the solar system beyond Neptune and the Kuiper Belt (4,5)
8.
Theorised hypothetical spherical shell of icy planetesimals beyond the orbit of Neptune and the Kuiper Belt (4,5)
9.
Celestial bodies to colour unusual opening of diorama (4,5)
10.
Comet-filled region of space
11.
The most distant region in our solar system named after a Dutch astronomer (4,5)
12.
Bubble at the far outer reaches of the Solar System that contains trillions of icy objects
13.
Solar system boundary
14.
A mass of comets orbiting the sun far beyond Pluto's orbit, named after a Dutch astronomer (4,5)
15.
Hypothetical spherical area of comets which may lie nearly a light-year from the sun