Open star cluster

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/open-star-cluster

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. What is the category?Star cluster
2. What is the formation mechanism?Gravitational collapse and fragmentation of giant molecular clouds
3. Why do open star clusters disappear over time?They are pulled apart by forces from the galaxy, nearby stars, and their own internal motions. Over hundreds of millions of years the stars drift apart and become ordinary field stars.
4. Where do open star clusters usually form?They form in the disk of spiral galaxies, especially in the spiral arms where giant molecular clouds are common.

Giant Molecular Cloud (GMC): Vast, cold interstellar reservoirs of gas and dust, the primary sites of star formation.
Stellar Isochrone: A theoretical curve on a Hertzsprung-Russell diagram representing stars of the same age and composition.
Galactic Archeology: The study of the Milky Way's formation and evolution by analyzing its stellar populations and structures.
Astrometry: The branch of astronomy concerned with the precise measurement of the positions and movements of celestial objects.