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| 1. | The final stage of a star's life cycle is a ____ dwarf, when the star will stop giving off any light. |
| 2. | Scientists believe that a star like the sun will shine for approximately ____ billion years. |
| 3. | A solar ____ is a fast-moving stream of charged particles that flows from the sun's corona and is released into space. |
| 4. | A dark area on the sun that is caused by magnetic storms. |
| 5. | The star at the center of the solar system. |
| 6. | This is the surface of the sun. |
| 7. | The Milky Way is known as a ____ galaxy. |
| 8. | Scientists estimate that the ____ may have as many as 200 billion stars. |
| 9. | Energy released from the sun travels through space in ____. |
| 10. | The four characteristics of stars include its ____, brightness, color, and temperature. |
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| 3. | A red giant that uses all its fuel will begin to collapse into a ____ dwarf. At this stage of a star's life cycle the star will give out very little light. |
| 11. | The sun is a huge ball of ____. |
| 12. | A star may form from this cloud of gas and dust in space. |
| 13. | A solar ____ is a sudden burst of energy or radiation from the sun. |
| 14. | The corona of the sun can only be seen during an ____. |
| 15. | The joining together of two or more atoms to form another atom. This powers the sun and other stars. |
| 16. | The ____ magnitude of a star is a measure of how bright a star seems to be when viewed from Earth. |
| 17. | A ___ giant is an old star of average size that has begun to expand and cool as its fuel has begun to run out. |
| 18. | Sunlight takes ____ minutes to reach Earth. |
| 19. | The ____ magnitude of a star is a measure of the actual brightness of a star. This measurement does not depend on the distance of the star from Earth. |
| 20. | The sun is about 93 million miles away from this planet. |
| 21. | ____ stars are stars with the hottest surface temperature. |
| 22. | The ____, the radiation zone, the photosphere, the convection zone, and the corona make up the layers of the sun. |
| 23. | A measure of the brightness of a star. |
| 24. | The color of a star is determined by its ____. |
| 25. | An instrument used by astronomers to study the light given off by stars. |
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