| GALILEO | He discovered Jupiter's moons and first observed Saturn's rings |
| TELESCOPE | Optical device through which Galileo Galilei observed Saturn's rings and four of Jupiter's moons (9) |
| SATURN | Planet surrounded by 60 known moons and circled by a system of rings including those of "A" and "B" separated by the Cassini Division (6) |
| ENCELADUS | The second nearest of the major regular moons of Saturn, the brightest of all its moons, and discovered in 1789 by the English astronomer William Herschel. The surface is almost pure water ice, with t |
| ORBS | Bubbles, moons and the like |
| NOSMOKING | Prohibitive sign displaying broken moons and monarch |
| RARITIES | Blue moons and hen's teeth |
| EUROPA | Companion of Io, Ganymede and Callisto among Jupiter's moons |
| HUYGENS | Dutch mathematician, astronomer, and physicist, who founded the wave theory of light, discovered the true shape of the rings of Saturn. He discovered Saturn's moon Titan with a telescope in 1655. |
| GREATBELZONI | In 1817, this collector of antiquities and explorer first set foot inside the tomb of Seti I in the Valley of the Kings, where he discovered Seti's sarcophagus. He was known by many epithets, but the |
| COLUMBUS | Clubs contain old and male and upper class he discovered (8) |
| SUPERMAJORITY | Landslide first observed in motion of Jupiter, Mars and last sign of Mercury (13) |
| SPOKANE | City in which Father's Day was first observed |
| NEPTUNE | It was first observed in 1846 |
| MVI | Year of the first observed supernova, in Rome |
| POSITRON | Antiparticle first observed in 1929 |
| GULLY | Seabird you at first observed in the Channel ... |
| MAIDENCENTURIES | Are they first observed by MCC? (6,9) |
| PAVLOV | Russian physiologist who first observed "conditioned responses" (6) |
| MTSINAI | Where the law was first observed |
