Question

1. which term describes a moon that orbits a planet in a backward motion?

○ barycenter
○ retrograde
○ satellite
○ dwarf planet

Explanation:

• Barycenter refers to the common center of mass of two orbiting bodies.
• Retrograde specifically describes orbital motion opposite to the primary body's rotation, i.e., "backward" orbit for a moon.
• Satellite is a general term for any object orbiting a planet, not describing orbit direction.
• Dwarf planet is a classification for celestial bodies that orbit the Sun, not moons orbiting planets.

Answer:

retrograde