Across
- 4. The study of movements of the planet, sun, moon and stars.
- 5. An ensemble of stars and interstellar matter held together by gravity.
- 6. Russell the relationship between a star's temperature and its luminosity
- 7. the study of everything in the universe beyond Earth's atmosphere
Down
- 1. a group of stars that appears to form a pattern
- 2. an exploding ball of burning gas held together by gravity
- 3. effect when a sound object moves towards you, the frequency of the sound waves increases, leading to a higher pitch.