sentence: Scientists think it was water vapour because lightning needs water vapour.
sentences_before: Most of the clouds on Jupiter are made of ammonia. There may also be clouds of water vapour similar to clouds on Earth. Spacecrafts such as Voyager 1 have seen lightning on the surface of the planet.
sentences_after: These lightning bolts have been measured as up 1,000 times as powerful as those on Earth.
concept_name: scientist
headings: Jupiter Structure Cloud layers
categories: Very good articles