The article discusses the shifting definitions of what constitutes a planet, highlighting the historical context and evolution of this classification. Initially, our solar system consisted of nine planets, including Pluto. However, discoveries of new celestial bodies like Eris prompted reconsideration, leading to debates that categorize such bodies as dwarf planets. The term 'planet' has deep roots in ancient Greek language, meaning 'wanderers,' but its modern implications have become contentious as new astronomical findings challenge prior definitions. This ongoing reassessment reflects both the complexity of our solar system and the terminology we use to describe it.
Planets are a mess. Or perhaps more to the point, our way of thinking about them is.
Although 'What is a planet?' seems like a simple question, it turns out it's anything but.
In the early 2000s the term planet wasn't terribly controversial... But then some pesky astronomers had to go and shake things up.
The ancient meaning of the word planetes means wanderers in ancient Greek, referring to the motion of planets against the backdrop of stars.
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