Across
- 2. A change in wavelength caused by motion
- 4. the distance it takes ___ to travel a year
- 6. The apparent shift of an object from different positions
- 9. A measurement of change and events in order
- 12. Large empty areas in space with very few galaxies
- 15. Matter made of particles with opposite charge
- 17. Two opposite charges or poles separated by a distance
- 18. A measure of how hot or cold something is
- 19. The way a object looks moving closer in space
- 20. A star whose brightness changes in a pattern
- 21. A temperature scale where zero is absolute zero
- 22. where matter is packed extremely tiny space with lots of density
- 24. The study of how the universe began and is structured
Down
- 1. A tool used to measure the brightness of light
- 3. The way a object looks moving away in space
- 5. A huge group of stars gas and dust held by gravity
- 6. The extremely hot early stage of the universe
- 7. Tool in space used to observe distant objects clearly
- 8. A region where gravity is so strong that light cannot escape
- 10. Dark or bright lines showing elements in light
- 11. The idea on how the universe began
- 13. The overall geometry of the universe like flat or curved
- 14. A very fast expansion after the universe began
- 16. The period when matter became the main thing shaping space
- 23. Cannot be seen directly