What model explains the planets orbiting around the sun?

What model explains the planets orbiting around the sun?

• A. Geocentric model
• B. Heliocentric model
• C. Ptolemaic model
• D. Aristotelian model

Answer: (B)

The main idea is that the Sun-centered arrangement explains why the planets orbit the Sun. In this model the Sun sits at the center and gravity pulls each planet toward it, creating the curved paths we call orbits. The planets don’t travel in perfect circles; they follow ellipses with the Sun at one focus, a detail clarified by Kepler's laws and explained by Newton’s gravity as the balance of forward motion and inward pull. This setup also makes retrograde motion—how a planet appears to slow, stop, and move backward from our view—easy to understand as a perspective effect when Earth overtakes an outer planet in its orbit. Earlier models that placed Earth at the center required extra, ad hoc epicycles to fit observations, whereas a Sun-centered model provides a simpler, more accurate explanation of planetary motion.

The main idea is that the Sun-centered arrangement explains why the planets orbit the Sun. In this model the Sun sits at the center and gravity pulls each planet toward it, creating the curved paths we call orbits. The planets don’t travel in perfect circles; they follow ellipses with the Sun at one focus, a detail clarified by Kepler's laws and explained by Newton’s gravity as the balance of forward motion and inward pull. This setup also makes retrograde motion—how a planet appears to slow, stop, and move backward from our view—easy to understand as a perspective effect when Earth overtakes an outer planet in its orbit. Earlier models that placed Earth at the center required extra, ad hoc epicycles to fit observations, whereas a Sun-centered model provides a simpler, more accurate explanation of planetary motion.