There's one in Zürich, too; the Planetenweg: https://de.wikipedia.org/wiki/Planetenweg_Uetliberg https://de.wikipedia.org/wiki/Planetenweg_Uetliberg It's the

There's one in Zürich, too; the Planetenweg: https://de.wikipedia.org/wiki/Planetenweg_Uetliberg https://de.wikipedia.org/wiki/Planetenweg_Uetliberg It's the same scale, 1:10^9, and is about seven and a half kilometres long. Each station has a model of the planet, to scale. The sun is a big yellow ball on a post. The gas giants are small balls. The rocky planets are little flecks of material encased in plastic... There are two Plutos, marking the summer and winter extremes.