Tag
IAU classification
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The Cosmic Count: How Many Planets in There—and What It Means for Us
The drama peaks in 2006, when Pluto’s demotion ignited global outrage. Overnight, textbooks changed, and children learned that how many planets in there now...
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Beyond Pluto: How Many Dwarf Planets Are There in Our Solar System?
The ambiguity stems from the IAU’s three-part definition: a dwarf planet must orbit the Sun, be round (or nearly so) due to its own gravity, and not have...