| OORTCLOUD | Theorised hypothetical spherical shell of icy planetesimals beyond the orbit of Neptune and the Kuiper Belt (4,5) |
| FEYENOORD | Rotterdam soccer club whose home ground is known as De Kuip (the tub) |
| SEAURCHIN | Marine animal with a spherical shell (3,6) |
| OORT | Jan -; Dutch astronomer who proposed the existence of a theorised shell of icy objects existing beyond the Kuiper Belt (4) |
| TRITON | A merman-like conch shell-trumpeting Greek god whose name is given to a moon of Neptune and a sea snail with a spiral shell (6) |
| SEASHELL | Hard evidence of life in realms of Neptune and Pluto (8) |
| BELT | A region of the solar system beyond the orbit of Neptune, consisting of icy debris (6,4) |
| KUIPER | A region of the solar system beyond the orbit of Neptune, consisting of icy debris (6,4) |
| KUIPERBELT | A flat ring of icy bodies that revolve around the sun beyond the orbit of Neptune (6,4) |
| PLUTO | A cartoon dog found beyond the orbit of Neptune |
| NEPTUNE | Name the planet beyond the orbit of Uranus (7) |
| ORRERY | Mechanical model of the solar system showing the orbits of the planets around the sun at the correct relative velocities (6) |
| ASTEROID | Any one of the celestial bodies between the orbits of Mars and Jupiter that were once designated symbols like the planets (8) |
| PERIGEE | Closest point to the Earth in the orbit of the moon or an artificial satellite (7) |
| APOGEE | Point in the orbit of the moon that's furthest from the earth (6) |
| SEDNA | Inuit goddess of the sea, after whom a dwarf planet past the orbit of Pluto is named (5) |
| ASTEROIDBELT | The region of space between the orbits of Mars and Jupiter in which many minor planets are located (8,4) |
| EROS | Greek god of love, or an asteroid in the orbit of Mars |
| LUCY | NASA space probe launched on 16 October 2021 to study the Trojan asteroids that share the orbit of Jupiter (4) |
| APSIS | Point in the orbit of a planet or satellite at which it is nearest to or furthest from the body around which it revolves (5) |
