If The Sun Is Bigger Than Pluto, Why Isn't Sun A Planet?

If The Sun Is Bigger Than Pluto, Why Isn't Sun A Planet?
astronomy-memes, planets-memes, solar-system-memes, sun-memes, pluto-memes | ScienceHumor.io

Someone's been skipping their astronomy lectures. The image shows an orange (labeled "Sun") next to some smaller fruits/objects (planets), with Pluto being practically microscopic.

Size isn't the determining factor for planethood—otherwise my department head's ego would qualify as a celestial body. Stars are massive balls of plasma undergoing nuclear fusion, while planets are just rocky/gaseous objects orbiting stars.

By this logic, I should ask why my coffee mug isn't classified as a teacup despite being larger than my colleague's teacup. The astronomy department would have a collective aneurysm reading this.

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