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Across
  1. 2. The contradiction between high probability of extraterrestrial life and lack of evidence
  2. 4. Hypothetical dark matter particle
  3. 5. Highly energetic and distant active galactic nucleus
  4. 10. Icy bodies surrounding the solar system
  5. 12. The rate of expansion of the universe
  6. 13. Rotating neutron star emitting beams of radiation
  7. 15. Facility that detected gravitational waves
Down
  1. 1. Radiation emitted by black holes due to quantum effects
  2. 3. Radiation leftover from the Big Bang
  3. 6. The epoch when the universe transitioned from opaque to transparent
  4. 7. Remnant of a supernova explosion, extremely dense
  5. 8. The imbalance between matter and antimatter in the universe
  6. 9. The closest distance a moon can orbit a planet before being torn apart by tidal forces
  7. 11. Hole A rotating black hole with angular momentum
  8. 14. Hypothetical particle. proposed as a dark matter candidate