Earth travels on an ellptical orbit around the Sun. When Earth is orbit, Which BEST explains this more ropid motion of Earth? The amount of solar heat reaching Earth is greatest at this point Earth Is closest to the Sun's radioactivity at this point The Sun's gravitational pull on the Earth is strongest at this point Earth is closest to the Sun's magnetic fleld at this point

# ExplanationThe question pertains to the dynamics of Earth's elliptical orbit around the Sun, specifically addressing why Earth moves most quickly at a certain point in its orbit. This point is known as perihelion, where Earth is closest to the Sun.According to Kepler's laws of planetary motion, particularly the second law (the Law of Equal Areas), a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. This implies that when the Earth is closer to the Sun (at perihelion), it must move faster to sweep out the same area as when it is farther from the Sun (at aphelion).The increased speed at perihelion can be attributed to the stronger gravitational pull exerted by the Sun. Gravitational force is inversely proportional to the square of the distance between two objects, as described by Newton's law of universal gravitation: where is the gravitational force, is the gravitational constant, and are the masses of the Sun and Earth, respectively, and is the distance between the centers of the two bodies. When decreases, increases, resulting in a stronger gravitational pull and hence a higher orbital speed.The other options provided (solar heat, radiocactivity, and magnetic field) do not directly influence the orbital speed of Earth in the context of its elliptical orbit.# AnswerThe Sun's gravitational pull on the Earth is strongest at this point