| A | B |
|---|
| Nebula | A vast cloud of dust and gas that gives rise to a protostar is called a — |
| Interstellar gas and dust | A nebula is comprised mainly of — |
| Hubble Telescope | Our understanding of nebulae has been greatly enhanced by — |
| Fusion will begin | Which of the following will most likely occur after a nebula contracts and its temperature increases to 10 million Kelvin? |
| About the same time | According to the solar nebula theory, the Moon and the Earth formed — |
| Cool and bright | Which of the following best describes giant stars?,  |
| Red giant | The Sun would be smaller and hotter than all of the following types of stars EXCEPT a —,  |
| Hydrogen | What element is the main component of most stars? |
| Hydrogen and helium | The gases that are predominant in stars are — |
| Nuclear fusion | The process that changes hydrogen to helium in a star is called |
| The church | The Sun−centered universe model was most disputed by which people? |
| Galaxy | A large group of stars with their solar systems is called a |
| Ours, Milky Way, spiral | Which galaxy is this?,  |
| Light years | The “measuring stick” that astronomers use to determine stellar distances is the — |
| The Big Bang Theory | The galaxies moving away from each other supports which theory? |
| The Milky Way | The name of the galaxy that contains the Sun and its components is |
| Luminosity | The measure of how much energy leaves a star in a certain period of time is called its — |
| Black dwarf | In the diagram of stellar evolution, it is clear that the last stage in a low mass star is —,  |
| The initial mass of the star | In the diagram of stellar evolution, it is clear that the main determinant of how a star dies is —, |
| HR diagram | The above diagram (table of stellar characteristics) relates absolute magnitude of a star to its temperature is called the —, |
| Main sequence star | According to the table of stellar characteristics, a yellow star of temperature 6000 degrees Kelvin of luminosity 1 would be classified as a —, |
| A red shift in the light from this occurrence | According to the diagram, evidence of this phenomenon would be —,  |
| Neutron star | Which stage of a star has the greatest mass?, |
| Copernicus | The scientist who first challenged the Earth−centered Universe model was — |
| Spiral galaxy | The shape of our galaxy is called what? |
| Protostar | Beginning with a nebulae, which is the next stage in the life cycle of a star?, |
