sentence: Similar interactions cause the northern lights on Earth.
sentences_before: Enceladus, the sixth largest moon, is about  in diameter. It is one of the few outer solar system objects that shows volcanic activity. In 2011, scientists discovered an electric link between Saturn and Enceladus. This is caused by ionised particles from volcanos on the small moon interacting with Saturn's magnetic fields.
concept_name: similar interaction
headings: Saturn Moons