Answer
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Step 1Here's a comprehensive explanation of why Pluto is now classified as a dwarf planet:
Step 2: Historical Context
In 1930, Pluto was originally discovered and classified as the ninth planet in our solar system. For decades, it was considered a full-fledged planet alongside Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Final Answer
Pluto is now called a dwarf planet because it does not meet all three IAU criteria for planetary status, specifically failing to clear its orbital neighborhood, despite orbiting the Sun and having sufficient mass to achieve a nearly round shape.
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