| Answer | Crossword Clue |
|---|---|
| ALIEN | Visitor from beyond our solar system |
| ALIEN | Visitor from beyond the solar system |
| OORT | .. cloud: solar system region beyond Pluto |
| PLANETX | Hypothetical solar system body beyond Neptune |
| NEBULES | Cloudlike masses beyond the solar system: Rare. |
| PLANETX | Hypothetical body in the solar system beyond Neptune |
