noun
Common loanword for a celestial planet. Used in both scientific and everyday contexts, often interchangeable with 惑星 (わくせい).
太陽系には8つのプラネットがある。
There are eight planets in the solar system.
新しいプラネットが発見された。
A new planet has been discovered.
惑星 is the native Japanese word for 'planet' and is more common in formal or scientific writing. プラネット is a loanword that feels slightly more modern or casual.
Borrowed from English 'planet'.