Effects of Planet Nine on trans-Neptunian objects

High school (ages 12+)
Space & Astronomy

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/effects-of-planet-nine-on-trans-neptunian-objects

1. How big is Effects of Planet Nine on trans-Neptunian objects?
2. What is the primary perturbation mechanisms?
3. What is the effect of orbital inclination?
4. What is Planet Nine and why do scientists think it might exist?
5. How does Planet Nine change the paths of icy objects in the outer solar system?

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. How big is Effects of Planet Nine on trans-Neptunian objects?Estimated between 5 and 10 Earth masses
2. What is the primary perturbation mechanisms?Angular momentum exchange and mean-motion resonances
3. What is the effect of orbital inclination?Weakens resonant protection, leading to chaotic orbital variations
4. What is Planet Nine and why do scientists think it might exist?Planet Nine is a big, invisible planet that could be tugging on icy objects far beyond Neptune. Its gravity might explain why some of those objects have similar, oddly tilted orbits.
5. How does Planet Nine change the paths of icy objects in the outer solar system?Its gravity can push an icy object's closest point to the Sun farther away, then later pull it back, making the orbit slowly change over millions of years.

Extreme Trans-Neptunian Objects (eTNOs): TNOs with semi-major axes greater than 150 AU and perihelia beyond 30 AU.
Orbital Precession: The slow rotation of an object's orbital ellipse around its central body.
Mean-Motion Resonance: A phenomenon where the orbital periods of two bodies are related by a simple integer ratio, leading to periodic gravitational interactions.
Laplace Plane: A dynamically defined reference plane in a multi-body system that minimizes the average inclination of orbits.