| PLANETS | Parts of the solar system (7) |
| LAPLACE | French mathematician and astronomer who formulated the nebular hypothesis concerning the origins of the solar system and who developed the theory of probability (1749-1827). |
| VOYAGER | US space programme that sent two unmanned probes to study the outer planets of the solar system in August and September of 1977 (7) |
| MERCURY | The innermost planet of the solar system (7) |
| SUN | Central part of the solar system |
| OORT | ___ cloud (distant part of the solar system) |
| SATURN | Part of the solar system launched into space (6) |
| EARTH | Dirtiest part of the Solar System |
| PLANET | Part of the solar system revealed by Pat and Len |
| NEBULAR | --- hypothesis, widelyaccepted theory explaining the formation and evolution of the solar system (7) |
| NEPTUNE | Distant planet of the solar system (7) |
| JUPITER | Largest planet of the solar system (7) |
| ORRERY | Mechanical model of the solar system showing the orbits of the planets around the sun at the correct relative velocities (6) |
| TYCHO | Danish astronomer (1546-1601) who made the most accurate measurements of the solar system prior to the invention of the telescope (5) |
| BRAHE | Danish astronomer (1546-1601) who made the most accurate measurements of the solar system prior to the invention of the telescope (5) |
| ANDERSEN | Danish author of fairy tales including The Little Mermaid, 31 The elliptical, heliocentric path of the solar system's planets, comets and asteroids around the Sun (5) |
| 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) |
| OORTCLOUD | Bubble at the far outer reaches of the Solar System that contains trillions of icy objects |
| ORBIT | The elliptical, heliocentric path of the solar system's planets, comets and asteroids around the Sun (5) |
