Clue | Source | Date |
---|---|---|
Traveler's flight (X = RIP) | Universal | 15 Mar 2023 |
Hypothetical solar system body beyond Neptune | New York Times | 20 Aug 2020 |
Hypothetical body in the solar system beyond Neptune | New York Times | 14 Nov 2018 |
Hypothetical body in the solar system beyond Neptune | ||
Term coined by Percival Lowell for a hypothetical world beyond Neptune | ||
Quest of the astronomer Percival Lowell |