| SUN | Largest object in the solar system |
| CERES | Largest object in the asteroid belt |
| PLUTO | Largest object in the Kuiper belt |
| VOLCANIC | The satellite Io has the most ___ activity of any object in the solar system |
| PROTEUS | Character in The Two Gentlemen of Verona; or, one of the newly-discovered moons of Neptune which is one of the darkest objects in the solar system (7) |
| JUPITER | Named after the supreme god in Roman mythology, the largest planet in the Solar System (7) |
| TITAN | The largest moon of Saturn and the only moon in the solar system known to have clouds and a dense atmosphere. It is the only body other than Earth that is known to currently have liquid on its surface |
| NEPTUNE | In 1989 space probe Voyager 2 came within 5000 km of this planet, the fourth largest in the Solar System |
| ERIS | Named after the Greek goddess of discord and strife, one of the largest known dwarf planets in the solar system (4) |
| EUROPA | Moon of Jupiter discovered by Galileo in 1610, the sixth-largest moon in the Solar System (6) |
| MERCURY | The smallest planet in the Solar System and the nearest to the sun (7) |
| UTOPIA | The largest impact basin on the planet Mars and in the solar system (6) |
| TITANIA | Uranus' largest moon and 8th largest in the solar system, discovered by William Herschel in 1787 (7) |
| EARTH | Fifth largest of the planets in the solar system (5) |
| PALLAS | The second largest asteroid in the solar system (6) |
| SATURN | The second-largest planet in the Solar System (6) |
| MARS | Home to the largest known volcano in the solar system |
| IBIDEM | One offer at the auction for half the object in the same place (6) |
| VENUS | The second brightest object in the night sky after the moon (5) |
| NEWTONSLAW | What (___ ___ of Gravity) concerns the pull of every object in the universe on every other object? (7,3) |
