Planets

2. The specific star cluster where our solar system is located.
6. Total number of Earth years it takes for Uranus to complete one orbit.
7. The solar system's largest moon, which is even bigger than the planet Mercury.
8. The ice giant famous for rotating on its side.
10. Astronomer who officially discovered Uranus in the late 18th century.
11. Neptune's largest moon, named after the son of a Greek sea god.
12. The largest planet in our solar system; the "first born."
14. A Venusian volcano that rivals the height of Earth's Mount Everest.
17. The smallest planet with the shortest orbit.
19. The percentage of stars in the Milky Way that actually host planets.
20. The number of years a single season lasts on Uranus.
21. Corrosive substance found in the rainfall of the Venusian atmosphere.
22. The Greek god of the heavens for whom the seventh planet is named.
23. The galaxy that contains our solar system.

1. The collective name for the gas and ice giants.
3. Unlike other planets named after Roman gods, Uranus takes its name from this mythology.
4. The only spacecraft to have visited the planet Neptune.
5. The chemical compound responsible for Uranus's distinct blue color.
9. The icy disk of debris that is home to Pluto.
13. Category of rocky planets like Earth and Mars.
15. A spherical collection of icy debris at the solar system's edge.
16. The hottest planet, known for its carbon dioxide atmosphere.
18. The cloud of gas and dust that collapsed to form the solar system.