Scientific Spectra

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Across
  1. 1. Explosive death of a massive star.
  2. 3. Unseen matter accounting for gravitational effects.
  3. 7. Subatomic particle with almost no mass.
  4. 8. Extremely bright and distant celestial object.
  5. 9. High-energy radiation from outer space.
  6. 12. Process of combining atomic nuclei.
  7. 13. Increase in wavelength of light due to motion.
  8. 14. Region of spacetime with strong gravitational pull.
  9. 15. High-energy electromagnetic radiation.
Down
  1. 2. Boundary beyond which nothing can escape.
  2. 4. Early stage of a star's formation.
  3. 5. Atoms with same element but different neutrons.
  4. 6. left over from the Big Bang.
  5. 10. Point of infinite density in a black hole.
  6. 11. Interstellar cloud of gas and dust.