Why is Pluto now called a dwarf planet?
Understand the Problem
The question is asking for the reasons behind Pluto's classification as a dwarf planet rather than a full planet. This involves concepts from astronomy regarding how celestial bodies are categorized.
Answer
Pluto is a dwarf planet because it hasn't cleared its orbit.
Pluto is now called a dwarf planet because it hasn't cleared its orbit of other objects and doesn't meet all the criteria set by the International Astronomical Union for full planet status.
Answer for screen readers
Pluto is now called a dwarf planet because it hasn't cleared its orbit of other objects and doesn't meet all the criteria set by the International Astronomical Union for full planet status.
More Information
In 2006, the International Astronomical Union redefined the criteria for what constitutes a planet. Under these new definitions, a celestial body must orbit the sun, be spherical in shape, and clear its orbit of debris. Pluto did not meet the third criterion.
Tips
A common mistake is assuming mass or size alone determines planetary status, but clearing its orbit is a crucial criterion.
Sources
- Why Is Pluto No Longer a Planet? - britannica.com
- Ever wondered why Pluto is no longer a planet? - washingtonpost.com
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