Scaling the Solar System in Year 5
This week, we decided to grab a measuring tape, and build a physically accurate scale model of the Earth-Sun system right here at school. We used a standard football, a tiny piece of Blu Tack, and a very long stretch of space. To make the math work, we started with our "Sun"—a standard size 5 football, measuring roughly 22 centimeters in diameter. If a football represents the Sun, how big is the Earth? And how far away should it be? After doing the calculations together, the results genuinely surprised the class: The Sun: A standard football (~22 cm diameter). The Earth: A tiny sphere of Blu Tack just 2 millimeters across (about the size of a single sesame seed or a small pinhead). The Distance: 23 meters apart! It’s one thing to calculate these numbers; it’s another to see them in real life. We took the class outside to line up our model. One pupil held the football Sun at one end of the playground, while another took the trundle wheel and walked 23 meters away to hold ...