The two planets that will be closest in size is Earth and Venus
When developing a scale model ( representing the sizes of the planet on a scale for easy understanding ) the planets are modelled to represent reality.
In the galaxy when planets are ranked based on their sizes ( diameter ), the biggest planet is Jupiter with a diameter of 142,800 km followed by Saturn with a diameter of 120,660 km and the third largest planet is Uranus with a diameter of 51,118 km. While the size of the Earth is 12,756 km and that of Venus is 12,104 km
Hence the two planets that should be closest in size on a scale model are Earth and Venus because their diameters are the closest
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