Sednoid

High school (ages 12+)
Space & Astronomy

Name:

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/sednoid

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 Sednoid?Inner Oort Cloud (IOC)
2. What is the orbital classification?Detached Trans-Neptunian Objects with high eccentricity
3. What is the minimum perihelion distance?Greater than 60 AU
4. Why are sednoids called "detached"?Because their closest point to the Sun is more than 60 astronomical units away, Neptune’s gravity barely affects them. This large distance keeps them essentially isolated from the giant planets.
5. Where do scientists think sednoids come from?They probably started closer to the Sun, near where the giant planets formed. When those planets moved and interacted, they flung the sednoids into their distant, eccentric orbits.

Trans-Neptunian Object (TNO): A celestial body orbiting the Sun with an orbit beyond that of Neptune.
Semi-major Axis: The average distance of an object from the Sun in its elliptical orbit.
Perihelion: The point in an object's orbit closest to the Sun.
Orbital Eccentricity: A dimensionless number describing how much an orbit deviates from a perfect circle (0 for a circle, <1 for an ellipse).