Can you imagine when those guys started to see moons in other planets? They must have shat bricks. What better evidence can you have that the geocentric model could be wrong?
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Jupiter is a gas giant composed mainly of hydrogen and helium. Increasing pressure inward changes hydrogen's physical state, so the visible cloud tops are not a solid surface on which a spacecraft could land. Deep electrically conducting material, internal motion and rotation contribute to its strong planetary magnetic field.[ref]
Jupiter Facts by National Aeronautics and Space Administration. Structure, Surface and Magnetosphere: composition, conducting hydrogen and the absence of a true solid surface
Its atmosphere is a laboratory for rotating-fluid dynamics: bands and persistent storms reveal motions above an interior that cannot be directly imaged. Gravity and magnetic measurements constrain deeper structure, while emerging thermal radiation probes the cooling energy budget. The category hot Jupiter compares an exoplanet with this giant-planet scale while allowing a very different irradiation environment.