IOK-1

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/iok-1

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 IOK-1?April 2006
2. What is the telescope used?Subaru Telescope, National Astronomical Observatory of Japan
3. What is the redshift (z)?6.96
4. Why is IOK-1 important?It shows that big galaxies and lots of stars already existed very early. This helps scientists learn how the first galaxies formed and grew.
5. How did scientists find IOK-1?They used the Subaru Telescope in Hawaii, taking deep pictures and spectra. The telescope spotted the galaxy’s bright Lyman‑alpha light.

Redshift (z): A measure of how much the light from an object has been stretched due to the expansion of the universe, indicating distance and age.
Cosmic Dawn: The theoretical period in the early universe when the first stars and galaxies began to form and emit light, ending the cosmic dark ages.
Lyman-alpha Emission: A specific spectral line emitted by hydrogen atoms, commonly observed in active star-forming regions of galaxies, especially at high redshifts.
Observational Cosmology: The branch of astronomy that uses observations and data to study the origin, evolution, and structure of the universe.