The Moon and Earth exert gravitational forces on each other. This causes loss of energy due to friction. As a result, the rotation rates of the Moon and Earth decrease, and their separation distance increases with time. The Moon is moving away from Earth at about 0.038 meters per year. The Moon will have moved so far from Earth after 250 million years, that it will no longer completely cover the Sun during an eclipse. By how many kilometers will the Moon-Earth distance increase before this happens?