Why is the Moon's orbital plane tilted relative to Earth's orbital plane?

Why is the Moon's orbital plane tilted relative to Earth's orbital plane?

• A. It is not tilted; it's perfectly aligned.
• B. It is tilted due to Sun's gravity.
• C. It is tilted because Earth gravity alone.
• D. The Moon's orbital plane is tilted about 5 degrees to the ecliptic due to past collisions and angular momentum distribution during formation.

Answer: (D)

The Moon’s orbit is tilted relative to Earth’s orbital plane because the Moon formed from a disk of debris around the early Earth after a giant impact. The material in that disk carried angular momentum that wasn’t perfectly aligned with Earth’s path around the Sun, so when the Moon accreted from that debris, its orbital plane ended up tilted by about 5 degrees to the ecliptic. Over time, gravity from the Sun and planets continues to perturb the Moon’s orbit, but the initial tilt reflects the angular momentum distribution at formation, not a force that later fixed the tilt.

The Moon’s orbit is tilted relative to Earth’s orbital plane because the Moon formed from a disk of debris around the early Earth after a giant impact. The material in that disk carried angular momentum that wasn’t perfectly aligned with Earth’s path around the Sun, so when the Moon accreted from that debris, its orbital plane ended up tilted by about 5 degrees to the ecliptic. Over time, gravity from the Sun and planets continues to perturb the Moon’s orbit, but the initial tilt reflects the angular momentum distribution at formation, not a force that later fixed the tilt.