some places also offer interplanetary hikes to scale this one is 1:310^9, and it has feel-the-gravity weights for the planets, too: https://sfeu.de/planetenwe

some places also offer interplanetary hikes to scale this one is 1:310^9, and it has feel-the-gravity weights for the planets, too: https://sfeu.de/planetenweg/index.html https://sfeu.de/planetenweg/index.html what I personally found mind blowing was insight into earth at scale. if you go for 1mm==10km then earth has 4m equatorial circumference, 1.28m diameter. bat that scale, Mt Everest is .8mm, the Mariana trench is 1.1mm and the distance from Nuremberg where I live to Erlangen "next door" is 1.6mm, and Germany is the size of my hand, and.big enough to have visible curvature. the outer 60km, that is 6mm at this scale, are solid, then it's dough, some places even pudding or outright liquid. the crust is* an eggshell, swimming on the inside of earth. breathable atmosphere is just a teensy thin .5mm layer, overall it's 2mm. such a model should be in every school, to me it's a deeply humbling experience, reminding me of the fragility of our habitat.