| A | B |
|---|
| sun | our nearest star; made up of mostly helium and hydrogen |
| core | innermost part of the sun; nuclear reactions take place here |
| radiation zone | cooler than the core; 2nd layer of the sun |
| convection zone | third layer of teh sun; gases hare continually rise and sink |
| photosphere | top layer of the sun; the layer that we see |
| chromosphere | inner layer of the sun's atmosphere |
| corona | outer layer of the sun's atmosphere |
| solar wind | flow of gases from teh sun that travel throughtout the solar system |
| sunspots | dark, cooler areas on the sun's surface |
| solar minimum | period with few sunspots and disturbances on the sun |
| solar maximum | period with a lot of sunspots and disturbances on the sun |
| solar flares | flashes that "erupt" off the surface of the sun |
| sun quakes | very large solar flares |
| coronal mass ejections | huge massive eruptions from teh sun, that cuase the aurora as well as other changes on earth (CME's) |
| SOHO | satellite that monitors the sun for information such as CME's (coronal mass ejections) |
| winter solstice | shortest day of the year, we are closest to the sun |
| equinox | days and nights are equal length |
| summer solstice | longest day of the year, we are furthest from the sun |
