Light is an electromagnetic wave, with a longer wavelength than X-rays and ultraviolet, and a shorter wavelength than infra-red, microwaves and radio waves.

WFC3's broad wavelength range, from ultraviolet to near-infrared, reveals starsat different stages of evolution, allowing astronomers to dissect the galaxy'sstar-formation history.

With SDO watching the sun in a wavelength of extreme ultraviolet light, the dark moon created a partial eclipse of the sun.