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Stellar Safari

Investigation total duration
1.5 hours

Next Generation Science Standards

Science literacy and critical thinking skills

  • Analyzing and interpreting data

  • Developing and using models

Three dimensional lesson summary:

Students use color-magnitude diagrams and models to analyze how the initial mass of a star determines its properties such as temperature, luminosity, fusion rate, and lifespan.

Building towards:

HS-ESS1-1 Develop a model based on evidence to illustrate the life span of the sun and the role of nuclear fusion in the sun’s core to release energy that eventually reaches Earth in the form of radiation.

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

Science and Engineering Practices

Developing and Using Models

Develop, revise, and/or use a model based on evidence to illustrate and/or predict the relationships between systems or between components of a system.

Students use isochrones to fit data in order to determine the distance and age of a star cluster.

Analyzing and Interpreting Data

Analyze data using tools, technologies, and/or models (e.g.,computational, mathematical) in order to make valid and reliable scientific claims.

Students use color-magnitude diagrams to compare the relative mass, temperature, fusion rate, size and lifespan of main sequence stars. They then use isochrones to analyze properties of star clusters.

Disciplinary Core Idea

ESS1.A: The Universe and Its Stars

  • The study of stars’ light spectra and brightness is used to identify compositional elements of stars and their distances from Earth.
  • The star called the sun is changing and will burn out over a lifespan of approximately 10 billion years.

Students analyze the relative mass, temperature, fusion rate, size and lifespan of main sequence stars using color-magnitude diagrams. They apply these concepts to compare properties of the Sun to other main sequence stars.

HS.PS3.D: Energy in Chemical Processes and Everyday Life

Nuclear fusion processes in the center of the sun release the energy that ultimately reaches Earth as radiation.

Students describe how the temperature, color and luminosity of a star is determined by its initial mass and evolutionary stage (such as main sequence, giant or white dwarf).

Crosscutting Concept

Scale, Proportion, and Quantity

The significance of a phenomenon is dependent on the scale, proportion, and quantity at which it occurs.

Students recognize how the initial mass of a main sequence star determines the rate of nuclear fusion and star’s characteristics.

Connections to Nature of Science Associated with Practices

Scientific Investigations Use a Variety of Methods

New technologies advance scientific knowledge.

Students recognize that Rubin Observatory will be able to image distant and faint stars and clusters, leading to a deeper understanding of stellar evolution.

Connections to Nature of Science Associated with Crosscutting Concepts

Scientific Knowledge Assumes an Order and Consistency in Natural Systems

  • Scientific knowledge is based on the assumption that natural laws operate today as they did in the past and they will continue to do so in the future.

  • Science assumes the universe is a vast single system in which basic laws are consistent.


  • Students explain how the initial mass of a main sequence star determines its rate of nuclear fusion and lifespan.

  • Students calculate distances to star clusters using mathematical models derived from observations of many stars.

Physics - Earth-Space Science Correlation Table

Are you working on integrating Earth-Space Science standards into your Physics class? Click on the link below and make of a copy of this Google Sheet to search by Performance Expectation (PE), Disciplinary Core Idea (DCI), or Rubin Observatory investigation.