Yes, you can scale the planets - if the Sun is a size of a room (5 m diameter), Jupiter will be about 50 cm, and Earth will be less than 5 cm in diameter. However, if you want to line them up on an ellipse that would represent their orbits, Earth would be 537 m (that's half a kilometre!) away from the Sun, and Neptune more than 16 km!
Watch this video to get an idea how complicated that is:
Go to this website and calculate the proportions of the planets, as well as their orbits.
If the Sun is a size of a typical soccer ball, how big is Mercury and Saturn? How far is Jupiter?
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