An Ultraviolet View of Young Stars
Our eyes can't see ultraviolet light, but we feel its wavelengths when sunlight burns our skin. Ultraviolet light is very damaging to living cells. Our atmosphere absorbs and blocks most ultraviolet radiation from reaching the surface. This means we study it using space-based instruments.
Star birth is an energetic activity. It gives off huge amounts of ultraviolet radiation. The Galaxy Evolution Explorer's image of the neighboring Andromeda Galaxy (left) shows great waves of star formation in its spiral arms.
The blue regions here are places where stars are forming. The yellow and orange areas in the bulge are filled with old, cool stars. The red dots are stars in our own galaxy.