How would the speed of Earths orbit around the sun change if Earths distance from the sun increased by 4 times?

If Earth's distance from the Sun increased by four times, its orbital speed would decrease significantly. According to Kepler's Third Law of Planetary Motion, the square of the orbital period is proportional to the cube of the semi-major axis of the orbit. Therefore, with an increased distance, Earth would take longer to complete an orbit, resulting in a slower speed, roughly one-half of its current average orbital velocity.