Iapetus (moon)

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/iapetus-moon

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. Who discovered Iapetus (moon)?1671
2. What is the discoverer?Giovanni Domenico Cassini
3. What is the orbital position?Outermost of Saturn's large moons
4. What makes Iapetus look so different on each side?Iapetus has a very dark side that looks almost black and a bright side that looks almost white. The dark side is covered with dust that sticks to it as the moon moves, while the bright side stays clean or has the dust removed.
5. Why does Iapetus have a huge ridge around its equator?The huge ridge around Iapetus's middle might have formed when the moon spun faster and was wider at the equator. The ridge could be material pushed up or leftover from a thicker ice layer that has thinned.

Albedo: The measure of how much light a surface reflects.
Oblate: Flattened at the poles and bulging at the equator.
Comparative Planetology: The study of planets by comparing their structure, composition, and surface features.