Across
- 7. the last stage of a dying star
- 10. the attraction between objects
- 12. a galaxy shaped like a spiral
- 13. how bright an object appears in the sky from Earth
- 14. a dying star that becomes massive
- 16. a cloud of dust and gas that develops into a star
- 18. a place where gravity is so strong that even light can't escape
- 21. how bright an object is viewed from 10 parsecs away
- 22. a star that is gravitationally bound to another
- 23. the amount of matter in an object
- 24. neutron stars that emit pulses of radiation in regular intervals
- 25. the method used to classify stars
Down
- 1. the complete range of all types of radiation
- 2. dust and gas left over from a dying star
- 3. a ball of ice and gas orbiting the sun
- 4. an asteroid that burns up in the Earths atmosphere
- 5. a star that emits X-rays
- 6. the brightest star in the sky
- 8. when two nuclei join together
- 9. a super massive black hole that feeds on gas
- 11. the difference in appearance of an object viewed from a different point
- 15. the explosion of a star
- 17. small rocky and metallic objects orbiting the sun
- 19. the tendency of matter to remain unchanged
- 20. a group of stars that forms an image