Why do planets orbit the Sun?

Answer: Sun's gravity pulls them

Sun's gravity pulls them ✓ — Correct! The Sun contains 99.8% of our solar system's mass, creating enormous gravitational pull. Planets would fly off in straight lines, but the Sun's gravity constantly pulls them inward. The result is a balance: the planet's forward motion combined with inward gravitational pull creates a curved orbit. The stronger the Sun's gravity and the closer the planet, the faster it must move to maintain orbit. This is why Mercury orbits in 88 days while Neptune takes 165 years.

Magnetic forces attract them — Wrong. While the Sun and planets have magnetic fields, these forces are extremely weak compared to gravity. Magnetic forces affect charged particles and some spacecraft, but they don't control planetary orbits. Gravity is the dominant force keeping planets in orbit.

Space vacuum pulls them inward — Wrong. Vacuum doesn't pull or push anything—it's simply empty space. Planets orbit because the Sun's gravity attracts them, not because space itself exerts any force.