Clarification Statement - S.HS.ESS.1.3.CS:
Emphasis is on the w ay nucleosy nthesis, and therefore the different elements created, v aries as a function of the mass of a star and the stage of its lifetime.

Assessment Boundary - S.HS.ESS.1.3.AB:
Details of the many different nucleosy nthesis pathw ay s for stars of differing masses are not assessed.

Science and Engineering Practices - 9-12.SEP8.1:
Communicate scientific and technical information the process of development and the design and performance of a proposed process or system) in multiple formats (including orally, graphically, textually, and mathematically).

Disciplinary Core Ideas - S.HS.ESS.1.3.DCI:
ESS1.A: The Universe and Its Stars •The study of stars’ light spectra and brightness is used to identify compositional elements of stars, their movements, and their distances from Earth. •Other than the hydrogen and helium formed at the time of the Big Bang, nuclear fusion within stars produces all atomic nuclei lighter than and including iron, and the process releases electromagnetic energy. Heavier elements are produced when certain massive stars achieve a supernova stage and explode.

Crosscutting Concepts - CC5.10:
In nuclear processes, atoms are not conserved, but the total number of protons plus neutrons is conserved.