| BOPP | Astronomer Thomas for whom a comet is named |
| HALLEY | Edmund for whom a comet is named |
| DONATI | Italian astronomer Giovanni Battista ___, after whom a comet is named |
| KUIPER | Gerard, astronomer after whom a belt of many comets is named (6) |
| HALLEYS | What a certain comet is called |
| COMMITTEES | Such as sit: comet is met with difficulties (10) |
| REINDEER | Maybe Comet is thinner, climbing to grip top of net (8) |
| LEBANESE | Danny Thomas, for one |
| LOCO | Thomas, for example, holding clubs in card game (4) |
| SCEPTIC | Thomas for one, having become infected, catches cold |
| TUTOR | Rout little Thomas for the sake of his guardian (5) |
| APOSTLE | Somehow lose Pat Thomas, for one (7) |
| DISBELIEVER | Crazy to relieve bids by doubting Thomas, for example (11) |
| ISLES | St. Croix and St. Thomas, for two |
| TANKENGINE | Thomas, for one |
| HERSCHEL | German-born British astronomer whose discovery of what he believed to be a comet, which he named after George III, was later identified as a planet and renamed Uranus (8) |
| ALANHALE | Astronomer who co-discovered a comet with Thomas Bopp |
| GREAT | Descriptor for a comet, in a Broadway show title |
| COMA | Nebulous envelope surrounding the nucleus of a comet; or, a group of bracts crowning a pineapple (4) |
| METEORSHOWER | A celestial event in which the Earth passes through a trail of dusty debris left by a comet (6,6) |
