Why won't Pluto collide with Neptune?
A)Pluto is always much farther from the Sun than Neptune.
B)Pluto orbits the Sun exactly 2 times for every 3 Neptune orbits,which ensures they never come close together.
C)Pluto's orbit never comes anywhere close to Neptune's orbit.
D)Actually,a collision of the two is inevitable within the next billion years.

Question

Quizplus · Accepted Answer

Pluto and Neptune are in a 3:2 orbital resonance, meaning Pluto orbits the Sun exactly 2 times for every 3 times Neptune does. This gravitational interaction ensures their orbits are stable and they never come close enough to collide.

Why Won't Pluto Collide with Neptune