Although Mount Everest is the highest above sea level, Mount Chimborazo in Ecuador is the farthest from Earth's center. Because Earth bulges at the equator, this volcano sits about 2 km closer to the Moon and stars than Everest!

When we measure mountains, we usually use Mean Sea Level. By that logic, Mount Everest is the king. But if you measure from the center of the Earth, the trophy goes to Mount Chimborazo in Ecuador.
Earth is not a perfect marble; it's an oblate spheroid. Because it spins so fast, it bulges at the middle (the equator) and flattens at the poles.
Everest is the highest for climbers starting from the sea, but Chimborazo is the highest for anyone looking down from the stars. It is the literal "edge" of our world.