PULSAR
| Date | Clue |
|---|---|
| 2025-04-19 | Celestial object producing a so-called "lighthouse effect" as it rotates |
| 2023-09-12 | Source of waves in space |
| 2021-03-11 | Dense, spinning celestial body |
| 2018-10-07 | Distant source of radio waves |
| 2017-09-17 | Celestial object that emits radio waves |
| 2013-12-25 | Distant radiation source |
| 2013-01-20 | Radio wave producer |
| 2011-02-04 | Heavenly radio source |
| 2001-04-10 | Celestial object |
| 2001-03-03 | Radio wave producer |
| 2000-07-29 | Astronomical discovery of 1967 |
| 1998-11-24 | Astronomical object |
| 1994-10-15 | Radio wave emitter |