Across
- 1. How tightly the material is packed within an object
- 4. The oldest and largest thing in existence
- 8. This factor determine the life cycle/ life span of a star
- 9. Force that collapses a nebula cloud
- 11. Motion of spinning on an axis
- 12. Incoming solar radiation
- 15. Model where Earth is the center of the solar system
- 17. The largest star on the HR diagram in ESRT
- 18. Change that is repeating and predictable
- 20. Day in march or September when the equator receives a 90 degree angle of insolation
- 21. Star located above Earth's axis
- 23. The most abundant element in the sun
- 25. The position east or west from the prime meridian
- 26. The two center points in an ellipse
Down
- 2. The true shape of an orbit
- 3. The measurement of how "flat" an ellipse is
- 5. Deneb belongs to this group of stars
- 6. Space object broken off from a meteor used to study the age and composition of the solar system
- 7. Nuclear process that occurs in the core of the sun
- 10. An object with a density of 0.8 will do this when placed in water
- 13. _ sphere that is the true shape of earth
- 14. Hottest layer of the sun
- 16. This planet's orbit has the highest eccentricity
- 17. Color of the hottest stars
- 19. Position North or South of the equator
- 22. Position furthest from the sun in orbit
- 24. Position in orbit when closest to the sun