Space

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Across
  1. 1. The outermost layer of the Sun's atmosphere (7 letters)
  2. 3. The rapid expansion of the universe (9 letters)
  3. 5. A hypothetical point in space with infinite density (7 letters)
  4. 7. The process by which stars produce energy (9 letters)
  5. 8. Hole A region of spacetime where gravity is so strong that nothing, not even light, can escape (6 letters)
  6. 9. The center of a galaxy containing a supermassive black hole (7 letters)
Down
  1. 1. The study of the origin, evolution, and structure of the universe (10 letters)
  2. 2. The measurement of a star's brightness (5 letters)
  3. 4. A celestial body that orbits a star (6 letters)
  4. 6. A galaxy that is not part of a larger galaxy cluster (9 letters)