6.2 Stars - A life story

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Across
  1. 4. A young star in the early stages of formation when clouds of gas and dust collapse and become dense.
  2. 5. Extremely dense remnants of a supernova in which protons and electrons in atoms are fused to form neutrons.
  3. 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.
  4. 9. Actual brightness of a star.
  5. 12. Star in the late stage of its life. They are cooler than main sequence stars.
  6. 13. Galaxy that includes our sun.
Down
  1. 1. Very large star that expands while running out of fuel and eventually explodes.
  2. 2. How bright a star appears to us on Earth.
  3. 3. Joining together of the nuclei of lighter elements to form another element, with the release of energy.
  4. 6. Ring of expanding gas caused by the outer layers of a star being thrown off into space.
  5. 7. The core remaining after a red giant has shed layers of gases.
  6. 10. Huge explosion that happens at the end of the life cycle of supergiant stars.
  7. 11. Area on the Hertzsprung–Russell where the majority of stars are plotted.