| 100% | HERSCHEL | 8 | Caroline __, astronomer, discovered many comets |
| 40% | ICES | 4 | Constituents of many comets |
| 38% | HERSCHEL | 8 | Astronomer who discovered Uranus |
| 37% | HERSCHEL | 8 | Astronomer who discovered Uranus: William __ |
| 37% | OLDESTKNOWN | 11 | Most ancient, discovered so far |
| 37% | GALILEO | 7 | Italian who discovered many of Jupiter's moons |
| 36% | ICE | 3 | It's what most comets are made of |
| 36% | HALLEY | 6 | Astronomer Edmond with a namesake comet |
| 35% | HUBBLE | 6 | Astronomer who discovered other galaxies in 1924 |
| 35% | HALEBOPP | 8 | Comet discovered in 1995 by two americans |
| 35% | HERSCHEL | 8 | William __; astronomer who discovered Uranus |
| 35% | NIGHTSKY | 8 | Caroline Herschel gazed into this to name comets |
| 35% | TUTTLE | 6 | Astronomer Horace for whom several comets are named |
| 34% | GALILEO | 7 | Astronomer who discovered the main moons of Jupiter |
| 34% | HALLEY | 6 | Astronomer Royal with a comet named after him |
| 34% | BOPP | 4 | Astronomer Thomas for whom a comet is named |
| 34% | HERSCHEL | 8 | German astronomer siblings William and Caroline |
| 34% | MESSIER | 7 | French astronomer who discovered 110 objects |
| 34% | HALLEY | 6 | Edmond __; astronomer who researched a comet |
| 34% | TOMBAUGH | 8 | Clyde, astronomer credited with discovering Pluto |
| 33% | KOHOUTEK | 8 | Comet seen in 1973 named after a Czech astronomer |
| 33% | HERSCHEL | 8 | William —, astronomer who discovered Uranus in 1781 |
| 33% | HERSCHEL | 8 | William, astronomer who discovered Uranus in 1781 |
| 33% | HERSCHEL | 8 | Caroline ___, German astronomer who was the first paid female scientist |
| 32% | BOPP | 4 | He independently discovered the same comet as Hale |
| 31% | HERSCHEL | 8 | William —, astronomer who discovered the planet Uranus in 1781 |
| 30% | DONATI | 6 | Italian astronomer Giovanni Battista ___, after whom a comet is named |
| 28% | DONATI | 6 | Giovanni Battista —, 19th-century Italian astronomer who pioneered the spectroscopy of comets |
| 28% | STAR | 4 | Earendel, discovered in 2022, is the earliest and most distant known one |
| 27% | BOPP | 4 | Thomas —, amateur astronomer; co-discoverer with Alan Hale of a comet in 1995 |