Imagine you are playing a game of tag with your friends, but instead of playing on the ground, you are playing in space among the stars. There are different types of players in this game, but one player in particular is called a "planetar."
"Planetar" is a type of player in space that is similar to a planet, but it's not quite the same. It's actually a type of celestial being that can be found in the fantasy world of Dungeons & Dragons.
These celestial beings are powerful beings that are aligned with good and are known for their ability to fight against evil forces. They are often described as being very tall and muscular, with wings and shining armor.
In astronomy, the term "planetary" refers to something completely different. It refers to planets that are similar to Earth, with solid surfaces, atmospheres, and orbit around a star. These planets can have different sizes and compositions, and they are often studied in order to understand how planets form and how they can support life.
So, while "planetar" and "planetary" may sound similar, they are actually very different concepts that apply to different fields of study.