Across
- 4. A young star in the early stages of formation when clouds of gas and dust collapse and become dense.
- 5. Extremely dense remnants of a supernova in which protons and electrons in atoms are fused to form neutrons.
- 8. The remains of a star, which forms when the force of gravity of a large neutron star is so great that not even light can escape.
- 9. Actual brightness of a star.
- 12. Star in the late stage of its life. They are cooler than main sequence stars.
- 13. Galaxy that includes our sun.
Down
- 1. Very large star that expands while running out of fuel and eventually explodes.
- 2. How bright a star appears to us on Earth.
- 3. Joining together of the nuclei of lighter elements to form another element, with the release of energy.
- 6. Ring of expanding gas caused by the outer layers of a star being thrown off into space.
- 7. The core remaining after a red giant has shed layers of gases.
- 10. Huge explosion that happens at the end of the life cycle of supergiant stars.
- 11. Area on the Hertzsprung–Russell where the majority of stars are plotted.