Stars and Galaxies

2. (NASA Galaxies) The shapes of ___ are influenced by their neighbors.
6. (HRD web page) The HR diagram is one of the most important tools in the study of...
7. (HRD Web Page) These are the last names of the two scientists that independently developed the HR Diagram.
8. (NASA Stars) Stars are fueled by the nuclear fusion of ____ to form helium deep in their interiors.
9. (NASA Stars) The most massive stars, known as ___, may be 100 or more times more massive than the Sun.
10. (NASA Galaxies) The Milky Way has a ___ shape.
11. (NASA Stars) Stars are responsible for the manufacture and distribution of heavy elements such as carbon, nitrogen, and ____.
14. (HRD Web Page) The ___ stretching from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) dominates the HR diagram.
16. (NASA STARS) Main sequence stars over eight solar masses are destined to die in a titanic explosion called a ___.
19. (HRD Web Page) Red giant and ___ stars occupy the region above the main sequence.

1. (HRD Web Page) The HR Diagram plots the temperature of stars against their...
3. (HRD Web Page)On an HR Diagram the color of stars is plotted against their...
4. (HRD Web Page) ___ stars are the final evolutionary stage of low to intermediate mass stars.
5. (NASA Stars) Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the ___.
12. (HRD Web Page) The___ is found on the main sequence with a luminosity of 1 and a temperature of around 5,400 Kelvin.
13. (NASA Galaxies) Our Galaxy
15. (NASA Stars) ___ are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies.
17. (NASA Stars) Known as a ___, it is this hot core at the heart of the collapsing cloud that will one day become a star.
18. (NASA Stars) A star the size of our ___ requires about 50 million years to mature from the beginning of the collapse to adulthood.