HS-ESS1-3: How stars make the elements
What students must show for performance expectation HS-ESS1-3, with a lesson sequence built on live data, the misconceptions to expect, and assessment questions with answers.
Last updated . Curriculum links last reviewed November 2026.
What students must show
Our summary- Students communicate scientific ideas about the way stars, over their life cycles, produce elements.
How the elements a star makes depend on its mass and its stage of life.
The detailed fusion pathways for stars of different masses.
Our summary, in our own words. Read the official wording.
The three dimensions
High schoolObtaining, evaluating and communicating information
Communicate ideas in several formats: spoken, graphical, written and mathematical.
ESS1.A The universe and its stars
Fusion inside stars builds nuclei up to iron; heavier elements form in supernovae; spectra show what stars are made of.
Energy and matter
In nuclear processes the total number of protons and neutrons stays the same.
Live tools for this standard
3 toolsLesson sequence
Engage to evaluate- Engage10 min
Ask: where did the iron in your blood come from? Collect ideas.
- Explore25 min
Jigsaw: groups research one stage (a small star, a Sun-like star, a massive star, a supernova, a collision of neutron stars) and the elements it makes, using telescope images of nebulae and supernova remnants.
- Explain20 min
Build a class "where the elements came from" periodic table: color hydrogen and helium (the big bang), carbon to iron (inside stars), and the heavier elements (supernovae and neutron-star collisions).
- Evaluate15 min
Students make a poster or a 60-second explainer for younger students.
Common misconceptions
3 to watch forAll the elements were made in the big bang.
The big bang made mostly hydrogen and helium; nearly everything else came from stars.
The class periodic table.
Stars burn fuel and the elements are just ash.
Fusion builds heavier nuclei from lighter ones and releases energy: the "ash" is new elements.
Track one helium nucleus through a star's life.
Gold forms inside ordinary stars like the Sun.
Elements heavier than iron need extreme events: supernovae and neutron-star collisions.
Find one on the class periodic table.
Assessment questions
Answers folded awayHS-ESS1-3: How stars make the elements · orbitalradar.com/schools/us/standards/hs-ess1-3
- Which element did the big bang make most of?
- Hydrogen
- Carbon
- Iron
- Why does fusion stop giving out energy at iron?
- Iron is too heavy to see
- Fusing iron takes in more energy than it releases
- Iron is a gas
- A Sun-like star ends as a white dwarf. Which elements will it have made?
- How do astronomers know which elements are in a distant star?
- Write a two-sentence caption for a supernova remnant image from the telescope page.
Answer key
- Hydrogen.
- Fusing iron takes in more energy than it releases.
- Helium, then carbon and oxygen.
- Its spectrum shows lines at wavelengths that belong to each element.
- It should say the star exploded and spread new elements, including heavy ones, into space.
Worksheet
US LetterNo live-data worksheet for this standard yet: print the assessment questions above. All sheets: the worksheet library.
The same idea in state standards
Texas, Florida, Georgia- Florida: SC.912.E.5.3
- Georgia: SAST5.a, SAST5.c
No close Texas match in the TEKS we cover.
Related, not equivalent: each state words and groups its standards differently.
More standards pages
High schoolAbout these codes
These are our suggestions for where each tool fits. Always preview a page before using it with a class: some tools show ads, these school pages do not.
Codes are performance expectations of the Next Generation Science Standards*, for example 5-ESS1-2. Each summary is our own wording; follow the link on a standard page for the official text.
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Cite this page
Pick a style, then copy it or download it for your reference manager.Orbital Radar. (2026, November 6). HS-ESS1-3: How stars make the elements. Retrieved November 6, 2026, from https://orbitalradar.com/schools/us/standards/hs-ess1-3
“HS-ESS1-3: How stars make the elements.” Orbital Radar, 6 Nov. 2026, orbitalradar.com/schools/us/standards/hs-ess1-3. Accessed 6 Nov. 2026.
Orbital Radar (2026) HS-ESS1-3: How stars make the elements. Available at: https://orbitalradar.com/schools/us/standards/hs-ess1-3 (Accessed: 6 November 2026).
Orbital Radar. “HS-ESS1-3: How stars make the elements.” Last modified November 6, 2026. https://orbitalradar.com/schools/us/standards/hs-ess1-3.
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* Next Generation Science Standards is a registered trademark of WestEd. Neither WestEd nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of this product, and do not endorse it.