| Answer | Crossword Clue |
|---|---|
| ERIS | Largest dwarf planet in the solar system |
| XENA | Dwarf planet in the outer reaches of the solar system |
| SATURN | Second-largest planet in the solar system |
| CERES | Body in our solar system that was considered a planet in the first half of the 19th century |
| retrogradation | The orbiting or rotation of a planet or planetary satellite in a reverse direction from that normal in the solar system |
| terrestrial | (of a planet) Similar in size or composition to the earth, esp. being one of the four inner planets of our solar system |
