QQuestionAstronomy
QuestionAstronomy
Use the information from the article to answer the question.
Why is Pluto now called a dwarf planet?
11 months agoReport content
Answer
Full Solution Locked
Sign in to view the complete step-by-step solution and unlock all study resources.
Step 1:I'll solve this problem by explaining the reclassification of Pluto as a dwarf planet:
Step 2:: Understanding Planetary Classification
In 2006, the International Astronomical Union (IAU) established new criteria for defining a planet. To be considered a full planet, a celestial body must meet three key requirements:
Step 3:
It orbits the Sun
Step 4:
It has enough mass to achieve a nearly round shape (hydrostatic equilibrium)
Step 5:
It must have "cleared the neighborhood" around its orbit
Step 6:: Pluto's Orbital Characteristics
Pluto fails the third criterion. While it orbits the Sun and is nearly spherical, it has not cleared its orbital neighborhood. Its orbit overlaps with many other objects in the Kuiper Belt, a region of icy bodies beyond Neptune.
Step 7:: Creation of the Dwarf Planet Category
To accommodate celestial bodies like Pluto, astronomers created a new classification called "dwarf planet". This category includes objects that: - Orbit the Sun - Have sufficient mass to assume a nearly round shape - Have not cleared their orbital neighborhood - Are not satellites of other planets
Step 8:: Specific Reasons for Pluto's Reclassification
- Pluto is much smaller than the other planets - It shares its orbital region with many similar-sized objects - Its mass is significantly less than the other eight planets - Its orbit is more elliptical and inclined compared to major planets
Final Answer
Pluto was reclassified as a dwarf planet because it does not meet all three criteria for a full planet, specifically failing to clear its orbital neighborhood, despite orbiting the Sun and being nearly spherical.
Need Help with Homework?
Stuck on a difficult problem? We've got you covered:
- Post your question or upload an image
- Get instant step-by-step solutions
- Learn from our AI and community of students