A tiny 8.75mm radius / 17.5mm diameter Earth representing the volume one would have to compress it in order to form a black hole.
For non-rotating black holes the Schwarzschild Radius also represents the distance from the singularity to the event horizon, so put otherwise, this globe also represents the "size" of an Earth mass sized black hole. Size in this case meaning the radius of the sphere after which an object falling towards the center of the black hole cannot escape.(escape velocity > light speed)
It is worth noting that were Earth suddenly replaced by this black hole the Moon, or even the ISS would continue orbiting around it as normal, since black holes merely have the mass of their parent object and don't actively "hoover" space around them.
