Key Aspects:
- Size and Orbit: Neptune's neighbor is a dwarf planet approximately 300 kilometers in diameter and orbits the Sun beyond Neptune, taking 400 years to complete one orbit.
- Composition: Neptune's neighbor is likely composed of rock and ice, similar to other dwarf planets in the outer solar system.
- Significance: Neptune's neighbor provides valuable insights into the formation and evolution of the outer solar system and the Kuiper Belt.
