Final answer:
The "Mn" in the diameter of Jupiter likely stands for megameters, which is 1,000,000 meters. Jupiter's diameter is about 140 megameters.
Step-by-step explanation:
The units "Mn" in the context of Jupiter's diameter likely represent megameters, where 1 megameter equals 1,000,000 meters. Jupiter's diameter is approximately 140 megameters or 140,000 kilometres. This makes Jupiter's diameter about 11 times that of Earth's and about one-tenth that of the Sun. Measuring planetary diameters helps astronomers understand the scale and structure of our solar system, including the vast volume of Jupiter, which can fit approximately 1,300 Earth-sized planets inside it.