Metallicity

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/metallicity

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 impact on stellar evolution?Metallicity influences a star's opacity, internal structure, luminosity, and spectral characteristics
2. What does "metallicity" mean in space?It is how much material heavier than hydrogen and helium a star or galaxy contains, measured as a ratio compared to hydrogen.
3. Why do stars with more metals look different?Stars that are metal‑rich are cooler and redder, while metal‑poor stars are hotter and bluer, because metals change a star’s opacity and the light it emits.

Spectroscopy: The study of the interaction between matter and electromagnetic radiation, used to determine elemental composition.
Nucleosynthesis: The process by which new atomic nuclei are created from pre-existing nucleons and nuclei.
Protoplanetary Disk: A rotating circumstellar disk of dense gas and dust surrounding a young star, from which planets may form.
Population III Stars: The hypothetical first generation of stars in the universe, composed almost entirely of hydrogen and helium.