| ASTRONOMY | Scientific study of the planets. stars. moons, galaxies, novae (9) |
| SEXSCENE | When you might see a star's moon? |
| ASTROGEOLOGY | Scientific study of the planets |
| BELGII | Symphyotrichum novi - - - - - -, American cousin of S. novae-angliae (6) |
| CHEMISTRY | The scientific study of the structure of substances (9) |
| HYETOLOGY | Scientific study of the origin, structure, and other features of rainfall (9) |
| NEUROLOGY | What is the scientific study of the nervous system? (9) |
| HELIOLOGY | The scientific study of the Sun (9) |
| HENRIETTA | American astronomer, ___ Leavitt, noted for her work on variable stars, used by later astronomers to measure the distance to other galaxies (9) |
| AREOLOGY | Scientific study of the planet Mars (8) |
| COSMICWEB | Structure of filaments connecting galaxies |
| GALILEO | Name of the robotic U.S. spacecraft launched on October 18, 1989, by the space shuttle Atlantis. It traveled to Jupiter in 1994 for extended orbital study of the planet, its magnetic field, and its mo |
| UNIVERSES | Galaxies |
| ASTRONOMICAL | Relating to the scientific study of the stars, planets and the universe as a whole (12) |
| GEOLOGY | The scientific study of the origin, history, structure and composition of the Earth (7) |
| HEAVEN | Empyrean abode of angels, God and saints in Christianity; or, usually in plural, a poetic word for the sky in which the moon, planets, stars and sun appear or move (6) |
| SELENOGRAPHY | What is the scientific study of the physical features of the Moon's surface? (12) |
| GERONTOLOGY | Scientific study of the ageing process and problems of the elderly (11) |
| SPACE | The intergalactic vacuum extending between planets/ stars; or, a gap between words (5) |
| DANE | Valerian and the City of a Thousand Planets star DeHaan |
