Black Holes

2. The speed at which an object must travel to escape the gravitational pull of another object
6. The spherical distance surrounding a black hole out of which nothing can escape
10. The huge space that contains all matter and energy in existence
12. A process where atoms are joined and tremendous amounts of energy are released
14. The kinds of stars that form black holes
15. What makes black holes so strong
18. Critical radius at which the escape speed of an object would equal the speed of light and the object can no longer be seen
19. Two objects in orbit around each other
20. A place in space where gravity pulls so much, that not even light can escape

1. Self luminous celestial body of gas
3. Exploding star
4. The mass of a neutron star exceeds 3 solar masses, equivalent to this white dwarf
5. What element is hydrogen fusing into in the center of a star?
7. A very dense star made up of neutrons
8. What element starts the life cycle of a star?
9. The shrinking of a star caused by the pull of its own gravity
11. The point at the center of a black hole
13. Breakdown of the center of the star
16. A spiral of gas that can surround a black hole
17. Cannot be created or destroyed