| A | B |
|---|
| binary stars | double-star systems |
| constellations | group of stars in which people thought they saw imaginary animals or figures |
| nova | star that suddenly increases 100 times in brightness |
| open cluster | well organized group of hundreds of stars |
| globular clusters | group of stars arranged in a spherical shape |
| nebula | birthplace of a new star |
| spectroscope | instrument that breaks up the light from a distant star into its colors |
| gravity | force of attraction betweeen objects |
| quasars | starlike object that gives off radio waves |
| giant star | star with a diameter of 10 to 100 times as large as our sun |
| supergiant star | star with a diameter up to 1000 times the diameter of the sun |
| white dwarf | star smaller than Earth |
| neutron star | smallest stars |
| corona | outermost layer of the sun |
| chromosphere | mid-layer of the sun's atmosphere |
| photosphere | innermost layer of the sun's atmosphere |
| core | center of the sun |
| prominences | solar storm with huge bright arches or loops |
| solar flares | solar storm with bursts of light |
| sunspots | dark areas on the sun's surface |
