Galaxy Classification
Students drag galaxies into the correct Hubble classification zone using visible structural clues, then use the feedback to connect galaxy morphology with stellar…
Home › Interactives › Earth & Space Sciences › HR Diagram Explorer
Earth & Space Sciences · Stars & the Universe
HR Diagram Explorer, Years 10–12
Students explore a star alongside its position on a Hertzsprung–Russell diagram, changing stellar mass and relating temperature, luminosity, radius and evolutionary position. The full interactive is available to licensed Education Universe users.
Years 10–12, UndergraduateExplorer
Learning outcomes
- Read temperature and luminosity from an HR diagram.
- Relate a star's mass to its position on the main sequence.
- Identify the main regions of the HR diagram.
Teaching guidance
Ask students to predict where a more massive star will sit on the diagram before changing its mass.
Use HR Diagram Explorer with your class
Start a free 30-day trial with class codes and progress tracking, or talk to us about your school's licence.
Related interactives
Galaxy Type Visualizer
Students compare three-dimensional representations of the major galaxy types and inspect how shape, stellar population, gas content and star-formation behaviour…
Hydrostatic Equilibrium Simulator
Students alter stellar parameters such as core temperature, fusion support and opacity and observe whether inward gravity and outward pressure remain balanced. It shows…
Nuclear Fusion Core Simulator
Students vary stellar-core temperature, density and hydrogen content and observe changes in proton–proton fusion rate, energy output and pressure support. The full…
Redshift Explorer
Students move a galaxy through cosmological distance, compare rest and observed spectral lines, calculate redshift from the wavelength shift and connect recession…
Solar Layers Explorer
Students explore the layered structure of the Sun and compare the physical conditions and roles of the core, radiative zone, convective zone, photosphere, chromosphere…
HR Diagram Explorer is one of the licensed interactives in The Education Universe. This page describes it; teachers use it in lessons and classes with a licence or the free trial.