| Answer | Crossword Clue |
|---|---|
| SKY | Cloud region. |
| OORT | ... cloud (solar-system region) |
| OORT | .. cloud (solar-system region) |
| OORT | ..... cloud: solar system region |
| OORT | .. cloud: distant solar system region |
| OORT | .. cloud: remote solar system region |
| OORT | .. cloud: solar system region beyond Pluto |
| OORT | ... cloud (comet-filled region of space) |
| OORT | ... cloud (region of comets far beyond Pluto) |
| OORT | .. cloud: comet-filled region in interstellar space |
