| HUBBLE | Edwin, U.S. astronomer with a space telescope named after him (6) |
| CASSEGRAIN | French astronomer who had telescope named after him |
| MOSES | Edwin, U.S. ex-400 metre hurdler who won two Olympic gold medals (5) |
| HALLEY | British astronomer with a comet named after him |
| EUCLID | Space telescope launched by the European Space Agency in July 2023 to study dark matter and dark energy (6) |
| EDWINHUBBLE | American astronomer after whom a space telescope, launched in 1990, is named (5,6) |
| ENTICE | Allure of space telescope's launch — cool! |
| CASSINI | Giovanni _; astronomer with a spacecraft named after him (7) |
| EDWIN | --- Hubble, American astronomer after whom a space telescope launched in 1990 is named (5) |
| KEPLER | Space telescope launched in 2009 |
| WEBB | James, NASA administrator after whom a space telescope launched in 2021 is named (4) |
| PTOLEMY | Astronomer with a geocentric model of the universe |
| HALL | Asaph, U.S. astronomer who discovered the moons of Mars (4) |
| TOMBAUGH | Clyde ___, U.S. astronomer who discovered the dwarf planet Pluto in 1930 (8) |
| SAGAN | Carl, U.S. astronomer and science writer noted for his 1980s TV series Cosmos (5) |
| OORT | Dutch astronomer with a namesake "cloud" |
| HUBBLEBUBBLE | Astronomer with delusion of prosperity makes water pipe (6-6) |
| BALALAIKA | Back room for scientist with a space traveller's instrument |
| UNIVERSE | A foreign institute near Limerick with a space for everybody (8) |
| DOUBLEGLAZING | Windows which have two layers of glass with a space between them (6,7) |
