The Universe

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Across
  1. 4. A scientist who studies space, stars and celestial objects
  2. 8. The process of matter collecting together into a bigger mass
  3. 9. A small, very dense star formed at the end of a small star’s lifetime
  4. 10. The average distance between Earth and the Sun (about 150 000 000 km)
  5. 11. 3.26 light-years
  6. 13. An infinitely dense point of matter that existed before the Big Bang
  7. 16. The distance that light travels in one Earth year
  8. 17. A system of millions or billions of stars
Down
  1. 1. A boundary just inside Jupiter's orbit
  2. 2. A vast region of gas and dust
  3. 3. A scientist who studies the physics of the universe
  4. 5. A star that has stopped fusing hydrogen in its core
  5. 6. The ability to tell two separate objects apart
  6. 7. A planet outside our solar system
  7. 12. Particles that have properties opposite to that of normal matter
  8. 14. An extremely dense star left over after a supernova
  9. 15. An explosion of a massive star at the end of its life