Across
- 5. The burning of the sun is ____ fusion process
- 7. Different views of the moon
- 8. Meteoroid that hits the Earth
- 11. Produces pulses of very high-energy waves
- 12. Extremely accurate clock that measured time at Greenwich
- 13. A ___ cluster consists of 100 000 to 1 millions stars located outside the Milky Way
- 14. The understanding of the beginning of the world
- 16. Mechanical tool for determining latitude
- 18. A ____ star is an extremely dense star made up of neutrons packed very close together
- 19. A ____ star is made of two stars traveling around each other
- 20. Head of a comet
- 22. The moon appears larger from new moon to full moon
Down
- 1. Another name for the North Star
- 2. When a red giant star in unstable, shedding its outer layers
- 3. Meteoroid that burns up completely in Earth's atmosphere
- 4. A shape of a galaxy
- 6. A tool scientists use to break white light into its spectral colours
- 9. Total amount of energy a star gives off per second
- 10. Small planet-like objects traveling between Mars and Jupiter
- 15. When the core of a supergiant star collapses and explodes
- 17. The day with 12 hours of day and 12 hours of night
- 21. Lump of rock-metal trapped by Earth's gravitational field
- 23. A cloud of gases and dust that swirl around in space