Choice board

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Across
  1. 3. Who are the scientists that study the universe beyond earth?
  2. 4. What is the theory that all matter and energy were at one time compressed into a very small hot dense spot?
  3. 6. What is the study of the universe?
  4. 7. what is a super-dense core left after a super giant explodes as a supernova?
  5. 10. What is the force pulling the universe apart and causing it to expand at a high speed?
  6. 11. What is the electromagnetic radiation left over from the big bang?
  7. 12. What is the sun and all the objects that revolve around the sun because of gravity called?
  8. 15. Everything that exists, all matter, all energy, space, and time?
  9. 17. What is the explanation to a scientific question that can be tested called?
  10. 19. What are a rotating type of galaxy with a central bulge spiral arms with stars, gas, and dust.
  11. 20. A celestial body orbiting around a star?
Down
  1. 1. What is 85% of the universe made out of?
  2. 2. what is the distance light travels in a year?
  3. 5. what is a large group of stars held together by gravity?
  4. 8. What is the most abundant element in the universe?
  5. 9. What is the ability to do work?
  6. 13. what is the system of ideas intended to explain something?
  7. 14. What is the process in which low-mass nuclei combine to form a more stable nucleus?
  8. 16. What is a giant cloud of gas and dust in space?
  9. 18. what is the infinite density and intense heat that came from the big bang called?