A satellite orbits the Earth with an elliptical orbit modeled by x squared over 43,824, 400 plus y squared over 47,196,900 equals 1 comma where the distances are measured in km. The Earth shares the same center as the orbit. If the radius of the Earth is 6,370 km, what is the maximum distance between the satellite and the Earth?

250 km
500 km
6,620 km
6,870 km