In the Next Generation Science Standards (NGSS), the life cycle of a star is primarily addressed at the high school level (Earth and Space Sciences), though foundational concepts start in middle school.

The specific NGSS performance expectations and core ideas that directly map to the life of a star include:

1. High School (Grades 9–12)

• HS-ESS1-1: Develop a model based on evidence to illustrate the life span of the sun to describe the role of nuclear fusion in the sun's core to release energy in the form of radiation.
  

  • Connection to star life: This standard focuses specifically on stellar evolution, tracing how a star like our Sun is powered by nuclear fusion, how it changes over billions of years, and what physical forces (gravity vs. outward thermal pressure) govern its stages.
    

• HS-ESS1-2: Construct an explanation of the Big Bang theory based on astronomical evidence of light spectra, motion of distant galaxies, and composition of matter in the universe.
  

  • Connection to star life: This standard ties heavily into what stars are made of initially (hydrogen and helium formed shortly after the Big Bang) and how astronomers use light to study stellar composition and movement.
    

• HS-ESS1-3: Communicate scientific ideas about the way stars, over their life cycle, produce elements.
  

  • Connection to star life: This is the core "stellar nucleosynthesis" standard. It explains how nuclear fusion within stars creates elements lighter than and including iron, while massive stars produce heavier elements during supernova explosions when they die.
    

2. Disciplinary Core Ideas (DCIs)

Underlying these performance expectations are the specific DCIs that teachers use to build lessons around stellar life cycles:

• ESS1.A: The Universe and Its Stars
  

  • The star system is part of a galaxy that evolved over time.
    

  • Burning hydrogen and helium fuels the life of stars. Through nuclear fusion, a star's core creates heavier elements, and its life cycle dictates how those elements are eventually dispersed back into the universe.
    

  • Other than hydrogen and helium, nuclear fusion inside stars produces all elements up to iron, while violent supernova explosions manufacture heavier elements.
    

3. Middle School Foundation (Grades 6–8)

While middle school doesn't go deep into the mechanics of stellar lifespans or nucleosynthesis, there is a foundational physics standard that supports energy generation:

• MS-PS1-4: Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed. (Often applied conceptually to understand how thermal energy and pressure interact in gas clouds and protostars).
  

• Note: In middle school ESS (MS-ESS1-1 and MS-ESS1-2), the focus is more heavily weighted toward the Earth-Sun-Moon system, gravity's role in the solar system, and the scale of the universe, leaving the detailed "life cycle of stars" for high school earth science.