Big Bang Theory.

1. a point where something becomes unique
3. a physical theory that describes how the universe expanded from an initial state of high density and temperature
4. a celestial body moving in an elliptical orbit around a star.
6. the capacity to do work
8. an elementary particle that is a quantum of the electromagnetic field
13. a branch of physics and metaphysics dealing with the nature of the universe
14. a celestial object in the night sky
15. a hypothetical form of matter in astronomy

2. all of space and time.
5. A big rock in space
7. a system of stars, stellar remnants, interstellar gas, dust, and dark matter
9. the observation in physical cosmology
10. the branch of physics that studies the interactions between electrically charged particles and their associated fields.
11. a phenomenon in physics and astronomy
12. a fundamental force of nature that causes objects with mass to attract each other