| Answer | Crossword Clue |
|---|---|
| ORB | Astronomical discovery |
| PLUTO | 1930 astronomical discovery |
| PLUTO | Astronomical discovery of 1930 |
| CERES | Astronomical discovery of 1801 |
| PULSAR | Astronomical discovery of 1967 |
| URANUS | Astronomical discovery of 1781 |
| QUASAR | Astronomical discovery of the 1960's |
| ERIS | Astronomical discovery initially called Xena |
