Across
- 2. Point in a planet's orbit closest to the Sun
- 5. Existing or occurring between stars
- 6. Pertaining to the sky or outer space
- 7. Outer boundary of the solar system's influence
- 9. Russian term for an astronaut
Down
- 1. Formation of elements in stars
- 2. Apparent shift in the position of an object when viewed from different angles
- 3. Study of the physical properties of celestial bodies
- 4. Ancient instrument used for celestial navigation
- 8. Recognizable pattern of stars within a constellation