This composite combines an optical image taken with Hubble Space Telescope in 2014 and observations of its auroras in ultraviolet light taken in 2016. Auroras are created when high energy particles enter a planet's atmosphere near its magnetic poles and collide with atoms of gas. Jupiter's auroras are hundreds of times more energetic than auroras on Earth. The strong magnetic field of the gas giant grabs charged particles from its surroundings. This includes not only the charged particles within the solar wind but also the particles thrown into space by its orbiting moon, Io, known for its numerous and large volcanos.