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aatventure
Jupiter is the ruler we use to measure other planets. When astronomers find a giant planet orbiting a distant star, the first thing they do is compare it to Jupiter. Its mass is given in Jupiter masses. Its radius is given in Jupiter radii. Its interior is modelled by adapting equations originally written for Jupiter.
Every assumption baked into our understanding of the largest planet in our own solar system gets carried, quietly, into our understanding of thousands of worlds we will never visit.
Which means that for the last decade, every exoplanet model has been working from a flawed reference.