Across
- 2. the horizontal angle used to describe an object’s direction in the sky
- 5. a model of the solar system with the Sun at the centre
- 8. a spacecraft propulsion method using radiation pressure from sunlight
- 12. the apparent shift in position of a nearby object due to viewpoint
- 16. the day with the longest amount of daylight in the year
- 17. a technique that combines signals from multiple telescopes
- 20. a cloud of gas and dust where stars may form
- 21. the day with the shortest amount of daylight in the year
- 23. a condition of very weak gravity, often experienced in orbit
- 25. an unmanned spacecraft sent to explore space
- 27. the point in the sky directly overhead an observer
- 28. an extremely dense remnant left after a supernova
Down
- 1. a space rock that reaches Earth’s surface
- 3. a small rocky object moving through space
- 4. to bounce light or waves off a surface
- 6. a recognized pattern of stars in the sky
- 7. a star that is fusing hydrogen into helium
- 9. an object that orbits a planet or other body
- 10. a model of the universe with the Earth at the centre
- 11. the explosive death of a massive star
- 13. an instrument that detects radio waves from space
- 14. a time of year when day and night are nearly equal in length
- 15. a massive system of billions of stars, gas, and dust
- 16. a large spacecraft where astronauts live and work in orbit
- 18. to bend light as it passes through different materials
- 19. the distance light travels in one year
- 22. an orbit where a satellite’s period matches Earth’s rotation
- 24. the change in wavelength or frequency caused by motion
- 26. the first artificial satellite, launched by the Soviet Union