Across
- 3. as neutron stars die, they
- 9. as black holes die, they
- 10. a star becomes a black hole when it as a mass greater than ___ solar masses
- 11. neutron stars are composed of these
- 12. a neutron star is born following an explosion called a
- 14. neutron stars emit intense X-__
- 15. black holes are not __ to the naked eye
Down
- 1. pulsars emit radiation at regular
- 2. neutron stars have a very strong
- 4. not even ___ can escape a black hole
- 5. black holes have the strongest ___ in the universe
- 6. type of black hole in the center of the milkyway
- 7. whether a star remains as a neutron star or becomes a black hole depends on
- 8. outer boundary of a black hole
- 13. type of neutron star that rotates and has pulses of radiation