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Jupiter was once twice as big. Scientists learned this by studying its small moons, Amalthea and Thebe.

Jupiter was bigger and had a strong magnetic field. This changed the moons' paths. It helps us learn how Jupiter and our solar system were formed.

Jupiter was once twice as big. Scientists learned this by studying its small moons, Amalthea and Thebe.

Jupiter was bigger and had a strong magnetic field. This changed the moons' paths. It helps us learn how Jupiter and our solar system were formed.