| HUYGENS | Physicist who developed the wave theory of light, described the shape of Saturns rings and discovered Titan (7) |
| DISC | Shape of Saturn's rings |
| TELESCOPE | Optical device through which Galileo Galilei observed Saturn's rings and four of Jupiter's moons (9) |
| YOUNG | Physicist and Egyptologist who helped to establish the wave theory of light and assisted in the Rosetta Stone's decipherment (5) |
| FRESNEL | Physicist who helped establish the wave theory of light and invented a lens used in lighthouses (7) |
| THOMASYOUNG | Polymath who helped establish the wave theory of light and decipher the Rosetta Stone (6,5) |
| EINSTEIN | Gennan-born theoretical physicist who developed the theory of relativity, Albert _ (8) |
| WATSONWATT | Depicted in Castles in the Sky, physicist who developed a radar that was pivotal in the allied victory of the Battle of Britain (6-4) |
| SHEPHERD | This term describes the minor moons Pandora, Prometheus, Janus, Epimetheus, and Pan, because of their ability to constrain the extent of Saturn's rings through gravitational forces. The term is also u |
| NERNST | German physicist who developed the third law of thermodynamics |
| RICHTER | Charles Francis -; seismologist and physicist who developed a scale for expressing the magnitude of an earthquake (7) |
| SUNBEAM | A shaft of solar light described as a "god ray" when observed during the crepuscular or twilight hour(s); or, dated Australian slang, rhyming with "clean", for a piece of crockery or cutlery laid for |
| GEIGER | German physicist who developed the Geiger counter (1882-1945). |
| VOLTA | Alessandro ___, Italian physicist who developed the first electrochemical cell (5) |
| COLOUR | Property or quality intrinsic to light described in a theory by Isaac Newton based on his observations of a prism (6) |
| DEWAR | British chemist and physicist who developed a vacuum flask, d1923 (5) |
| TSUNAMI | Wave theory starting with a minus of sorts (7) |
| MARCONI | Guglielmo ___, Italian physicist who developed radiotelegraphy (7) |
| HANSGEIGER | German physicist who developed an instrument for detecting radiation (4,6) |
| ICE | Primary component of Saturn's rings |
