| A | B |
|---|
| aurora | A glow in the night sky produced in the upper atmosphere by particles from the solar wind interacting with Earth's magnetic field |
| chromosphere | The inner layer of the sun's atmosphere, located above the photosphere and below the corona |
| corona | The outer most layer of the sun's atmosphere |
| fusion | The combining of the nuclei of lighter elements to form a heavier element |
| geocentric | A model of the solar system that has the earth at the center |
| gravitation | The force of attraction between any two objects with mass; the strength of the attraction is proportional to their masses and inversely proportional to the distance between them. |
| heliocentric | A model of the solar system that has the sun at its center. |
| photosphere | The visible surface of the sun |
| plasma | A state of matter consisting of charged particles- positively charged ions and negatively charged electrons |
| solar wind | A constant stream of electrically charged particles that is blown out from the sun in all directions |
| sunspot | dark areas on the sun's photosphere that result from variations in the sun's magnetic field |
