Category Archives: dwarf planet

Blog #5: Pluto’s Demotion

As of August 24th  2006, the international astronomical union voted to demote Pluto to a dwarf planet, ending the nine planet era, redefining the definition of a planet, and rendering many, many astronomy books obsolete. But why was Pluto demoted? What happened to make astronomers cut away a part of so many people’s worldview? Will … Continue reading Blog #5: Pluto’s DemotionContinue reading Continue reading

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Pluto the Dwarf Planet

Many of us remember Pluto as the used-to-be 9th planet in our solar system that was demoted to a dwarf planet. So what makes Pluto a dwarf planet and not a planet? What is interesting about Pluto, and, if it was so small, how exactly was it discovered earlier than other dwarf planets?Continue reading Continue reading

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Pluto – A Dwarf Planet

Pluto is a Dwarf planet in the ring of objects beyond Neptune called the Kuiper Belt. Similar to other objects in the Kuiper Belt, Pluto is composed of rock and ice. Its orbital period is 248 Earth years, and has an inclined orbital path compared to all the planets whose paths lie in the ecliptic […] Continue reading Continue reading

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The Dwarf Planet Sedna

According to Inuit mythology, Sedna was the name of a mortal woman who became a goddess of the ocean and the underworld. One version of the myth holds that Sedna was a young woman who consented to marry a hunter, only to find, once she had left home with him, that he was in fact […] Continue reading Continue reading

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The definition of “planet”

Ever since the IAU gathered in Prague in 2006 and published a new scientific definition of “planet”, there has been debate on how well they did, and whether they were right to “demote” Pluto from planet to the new “dwarf planet” classification. I aim here to critique the IAU’s definition of a planet. First, here […] Continue reading Continue reading

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