I thought that it might be fun to build a scale mode of the solar system. I decided to use the scale of 10 centimeter = 1 billion meters. I started by obtaining an enormous beach ball (1.4 meters or a little over 3 ft in diameter) as the sun. So I went to a softball field and placed the sun at home plate. Next came Mercury, a grain of sand 6 meters (18 feet) away, a third of the way to the pitcher's mound. Venus was 1.2 mm, a tiny pebble and was 10.7 meters from home plate, halfway to the pitcher's mound. Earth was about the same size 1.3 mm, another tiny pebble. I placed it 15 meters from home plate, three quarters of the distance to the pitcher's mound. Mars was a tiny, tiny pebble (0.6 mm) 22 meters from home plate, just outside the pitcher's mound.
At last I began to deal with some substantial planets. Jupiter was 14 centimeters in diameter, the size of a softball. I placed it 77 meters (253 feet) from home plate. I was now in deep centerfield. Saturn was 12 cm (5 inches), a slightly smaller ball. I had to leave the field to place it 1.4 km (0.8 miles) away. Uranus was about 6 cm (2.5 inches) and was placed 2.8 km (1.7 miles) from home plate, Neptune was 4.9 cm (2 inches) and 4.5 km (2.8 miles) away. Finally there was poor little Pluto, the dwarf planet, a grain of sand, 5.8 km (3.6 miles away).
Of course, I did this exercise in my head and making calculations of paper. It couldn't be done in real life unless one had a large property such as a farm or an estate to work with. What I think this shows is that the solar system is a really big place.
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