Which of the following is defined as a spherical heavenly body in orbit around the sun?

The definition of a spherical heavenly body in orbit around the sun aligns perfectly with the concept of a planet. According to the International Astronomical Union (IAU), for an object to be classified as a planet, it must orbit a star (like the sun), have sufficient mass for its self-gravity to overcome rigid body forces and assume a nearly round shape (hydrostatic equilibrium), and have cleared its neighboring region of other debris.

In contrast, stars are massive celestial bodies that produce energy through nuclear fusion and do not orbit the sun as they are the sun itself. Asteroids are smaller rocky bodies that may orbit the sun but do not meet the spherical shape requirement. Meteors, on the other hand, are the streaks of light produced when meteoroids enter the Earth’s atmosphere and do not exist in a stable orbital path around the sun. Thus, the only correct choice that fits all criteria for a spherical heavenly body in orbit around the sun is a planet.