Detailed Explanation:

The Sun is the central and most massive body of the solar system, containing over 99% of its total mass. All planets, asteroids, comets, and other celestial objects revolve around it due to its immense gravitational pull.

Jupiter and Saturn are the largest planets but remain much smaller than the Sun. Earth is our home planet but neither central nor dominant in mass.

Therefore, the Sun is the chief heavenly body, making Option 3 the correct answer.