1			2		3
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6
														7
								8
				9		10
								11
12

Across 4. A diffuse mass of interstellar gas and:or dust 6. An super dense celestial body, the remains of a massive star 9. 3.0e8 meters per second 11. A large luminous star with relatively low surface temperature 12. 9.5e12 kilometers

Down 1. Extremely strong stellar explosion 2. Mean distance between Earth and Sol 3. A measure of star brightness 5. A curvature of spacetime so intense it traps light 7. A extremely dense star formed from the collapse of a low mass star 8. Celestial bodies of hot gases with thermonuclear explosions 10. A large collection of stars held together by gravity