Abell 2744

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/abell-2744

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 heavy is Abell 2744?Galaxies (<5%), Intracluster Medium (~20%), Dark Matter (~75%)
2. What is the cosmological distance?Approximately 4 billion light years
3. What is the merger epoch?Formation span of approximately 350 million years
4. Why is it called Pandora's Cluster?The name comes from the many surprising and complex events that happen when the clusters smash together, like opening a box full of mysteries.
5. How far away is Abell 2744?It is about 4 billion light‑years from Earth, so we see it as it was a long time ago.

Hierarchical Structure Formation: The cosmological model where large structures like galaxy clusters form from the gradual merging of smaller structures over time.
Intracluster Medium (ICM): The hot, ionized gas found in the space between galaxies within a galaxy cluster, detectable via X-ray emission.
Gravitational Lensing: The distortion and magnification of light from distant sources by the gravitational field of massive foreground objects, used to map mass distributions.
Lambda-CDM Model: The standard model of cosmology, which describes the universe as composed of dark energy (Lambda) and cold dark matter (CDM).