Across
- 2. Estimate number of galaxies in the universe
- 3. The four planets that orbit closest to our sun
- 7. Three types of galaxies
- 10. number of planets that orbit our sun
- 12. space and all matter and energy in it
- 13. area of space that contains as many as several galaxies
- 15. A small galaxy consisting a few as 100 million stars
- 16. A large collection of stars, and dust that is held together by gravity
- 17. The galaxy our solar system resides in its a spiral galaxy
- 19. A spherical body that orbits the sun
- 20. have a central bulge from which two or more spiral arms extend
Down
- 1. The process that produces energy in stars
- 4. Looks like spheres or ovals, and they do not have spiral arms
- 5. The collection of large and small bodies that orbit our central star,the sun
- 6. The distance that light travels through space in One year
- 8. Appear as splotcy, irregulary shaped "blobs"
- 9. a large celestial that is composed of gas and emits light
- 11. four planet that orbit farthest in our sun
- 14. Area of space that contains as many as ten or more clusters
- 17. small bodies that orbit planets
- 18. Area of space where no or little matter exist