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