Big bang theory

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Across
  1. 2. - What do we call a sudden burst of light and energy from a star?
  2. 6. - What device do we use to see distant stars and planets?
  3. 8. - What is the name of our galaxy?
  4. 10. - What chemical element has the symbol O and is essential for breathing?
  5. 11. - What do we call the path of a planet around the Sun?
Down
  1. 1. - What do we call a huge system of stars, gas, and dust in space?
  2. 2. - What is the name of the planet we live on?
  3. 3. - What word describes something “not ordinary” or “unique”?
  4. 4. - What force keeps us on the ground?
  5. 5. - What is the name of the process where stars are born from gas and dust?
  6. 7. - What do astronauts travel in to go to space?
  7. 8. - What do we call the natural satellite of Earth?
  8. 9. - What is the study of space and the universe called?