space

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Across
  1. 3. / everything that exists is inside this
  2. 7. / a huge collection of stars,planets,gas,and dust that is held together by gravity
  3. 8. / the most abundant form of matter in the universe, invisible to telescopes
  4. 9. / the expanding of the universe
  5. 10. / the event that may have triggered the expansion of the universe 14 billion years ago
  6. 12. / a celestial body made of hot gasses, mainly hydrogen and helium
Down
  1. 1. / a collection of stars held together by gravity
  2. 2. / The galaxy that has the solar system and appears as a hazy white band in the night sky
  3. 4. energy / the cause of the expanding of the universe
  4. 5. / the study of the universe
  5. 6. / a piece of rock moving through space
  6. 11. / a vast cloud of gas and dust, which may be the birthplace of stars and planets