TEK 8.9A Crossword

2. an interaction between two nuclear particles or two nuclei that results in the formation of new nuclei different from the original ones.
4. luminous quality.
5. the name of the galaxy where our solar system resides.
6. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
9. all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.
10. flat, thin, and circular like a disk.
11. dense remnants of stars, specifically those with a mass of about one solar mass, that have exhausted their nuclear fuel.
13. extremely large and luminous stars, characterized by their massive size and brightness.
14. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.

1. a system used to classify stars based on their temperature and the absorption lines in their spectra.
3. an imaginary or mythical being of human form but superhuman size.
5. a series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band extending from the upper left (hot, bright stars) to the lower right (cool, dim stars).
7. a theoretical stellar remnant, specifically a white dwarf that has cooled down so much that it no longer emits significant heat or light.
8. a plot of stars showing the relationship between their luminosity and temperature.
12. the process or result of joining two or more things together to form a single entity.