Challenging puzzle for experienced crossword solvers
Mysteries of Cosmic Expansion
Explore key concepts and phenomena related to the expanding universe, galaxies, and celestial mechanics.
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Across
- 1. Explosive death of a star
- 2. High-energy particles from space reaching Earth
- 3. Massive system of stars, gas, and dark matter
- 9. Force that attracts objects toward each other
Down
- 4. Object orbiting a planet or star
- 5. A cloud of gas and dust in space
- 6. Extremely bright and distant active galactic nucleus
- 7. Invisible substance making up most of the universe's mass
- 8. The scientific study of the universe's origin and development
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