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Across
  1. 2. sequence star, A stable star that fuses hydrogen into helium in its core.
  2. 5. A powerful explosion marking the death of a massive star.
  3. 6. The largest planet in our solar system, known for its Great Red Spot and many moons.
  4. 8. A thin layer of a star's atmosphere just above the photosphere.
  5. 11. dwarf, The remnant of a small to medium-sized star that has exhausted its nuclear fuel.
  6. 12. The visible surface of a star, from which light is emitted.
  7. 13. zone, The region where hot plasma rises and cooler plasma sinks, transporting energy to the star's surface.
  8. 14. The second planet from the Sun, known for its extreme temperatures and thick atmosphere.
  9. 16. The closest planet to the Sun, with extreme temperature variations.
  10. 20. A vast cloud of gas and dust in space, often the birthplace of stars.
  11. 21. The outermost layer of a star's atmosphere, visible during a solar eclipse.
  12. 23. The third planet from the Sun, home to diverse life forms and liquid water.
Down
  1. 1. The fourth planet from the Sun, famous for its red surface and potential for past water.
  2. 3. The eighth planet from the Sun, known for its deep blue color and strong winds.
  3. 4. zone, The layer of a star where energy is transferred outward through radiation.
  4. 7. A young star still in the process of forming from a collapsing nebula.
  5. 9. diagram, A graph that plots stars based on their luminosity and temperature.
  6. 10. star, A large, evolved star with a cooler surface and higher luminosity than the Sun.
  7. 15. A gas giant with a unique tilt, rotating on its side in relation to other planets.
  8. 17. hole, A region in space where gravity is so strong that not even light can escape.
  9. 18. nebula, A ring of gas ejected by a dying star during the later stages of its life.
  10. 19. A gas giant with prominent rings, the sixth planet from the Sun.
  11. 22. A massive ball of gas that emits light and heat due to nuclear fusion in its core.