1.
planet
A celestial body that orbits a star, is large enough to have cleared its orbital path, and is not a star itself.
惑星 refers to a planet. 惑 means 'bewildered/wandering' (planets appear to wander across the sky) and 星 means 'star.'
The solar system planets
Related words
Note: 冥王星 (Pluto) was reclassified as a 矮小惑星 (dwarf planet) in 2006.
Related Words
Related:
彗星 (comet)
Related:
宇宙 (universe)
Related:
星 (star)
Related:
恒星 (star)
Related:
衛星 (satellite/moon)