⚙️ how
How do scientists tell the difference between a planet, a dwarf planet, and an asteroid?
Quick Answer
They look at whether the object orbits the Sun, is nearly round, and has cleared most of its orbital neighborhood.
The Full Story
The International Astronomical Union set the modern planet definition in 2006. A planet must orbit the Sun, be massive enough for gravity to make it nearly round, and have cleared its orbital zone of other debris. Dwarf planets meet the first two requirements but have not cleared their neighborhoods, which is why Pluto is classified as a dwarf planet. Asteroids are generally much smaller rocky bodies that are not round enough to qualify as planets.
Key Facts
1.The IAU definition was adopted in 2006
2.Pluto is a dwarf planet
3.Planets must clear their orbital neighborhood
YouTube Angle
Suggested video title for this topic:
"Not every round world is a planet — the Solar System has strict rules."
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