Across
- 4. all existing matter and space
- 8. brightness of a celestial object
- 10. the dense stellar core that remains after a star like our sun has exhausted its nuclear fuel
- 12. a white dwarf that has cooled down so much that it no longer emits heat or light
Down
- 1. in which nuclei, or nucleus and external subatomic particle collide
- 2. cloud of gas and dust in outer space
- 3. plots the magnitude of stars
- 5. an extremely large,luminous, and massive star
- 6. a massive collection of stars, gas, and dust bound together by gravity
- 7. result of joining 2 or more things together
- 9. a away of classifying stars based on their surface temperature
- 11. a system of millions or billions of stars