Cosmos Redshift 7

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/cosmos-redshift-7

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 object designation?Cosmos Redshift 7 (CR7)
2. What is the photometric redshift?Approximately 6.3
3. Why is Cosmos Redshift 7 important?CR7 helps scientists learn about the first stars and how the early universe changed from being dark to bright. It shows us clues about the first light that turned the universe into the place we see today.
4. How far away is Cosmos Redshift 7?The light from CR7 has traveled about 12.9 billion light‑years to reach us, meaning we see it as it was when the universe was just 5% of its current age.

Epoch of Reionization: The period when the early universe transitioned from neutral to ionized hydrogen, driven by the first light sources.
Population III Stars: Theoretical first-generation stars, composed almost entirely of primordial hydrogen and helium, metal-free.
Spectroscopy: The study of the interaction between matter and electromagnetic radiation, used to analyze the composition and properties of celestial objects.
Ionized Helium (He II): Helium atoms that have lost one electron, requiring high-energy ultraviolet photons, indicative of extremely hot stellar sources.