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Across
  1. 5. is another name for the Universe
  2. 7. A black hole is a region of spacetime where gravity is so strong that nothing no particles or even electromagnetic radiation such as light can escape
  3. 8. is all the space and time
  4. 9. a gravitationally bound system of stars
Down
  1. 1. is the galaxy that includes our Solar System,
  2. 2. gravitation, is a natural phenomenon by which all things with mass or energy
  3. 3. Dark matter is a hypothetical form of matter
  4. 4. A planet is a large astronomical body that is not a star or stellar remnant
  5. 6. is an astronomical object consisting of a luminous spheroid
  6. 7. Big Bang theory is the prevailing cosmological model explaining the existence of the observable universe