Hubble’s Law and Cosmic Expansion
by Anonymous
See how galaxies’ distances relate to their spectral-line shifts, then explore the straight-line slope H₀ and how 1/H₀ reveals the universe’s age.
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About this app
Hubble's Law and the Expanding Universe is an interactive astronomy learning app for exploring how galaxy distance relates to redshift and recession speed. Compare absorption-line shifts for five galaxies, adjust the Hubble constant H₀ to see how the distance–velocity line changes, and use 1/H₀ to estimate the universe’s age against the reference value of 13.8 billion years. Guided missions provide structured practice across redshift, Hubble’s law, and cosmic age.
Use cases
- High school Earth science students studying cosmic expansion
- Teachers demonstrating redshift and Hubble’s law in class
- Learners comparing galaxy distance with recession speed
- Students investigating how H₀ affects estimated cosmic age
Features
- Interactive redshift comparison for galaxies from 10 to 1000 Mpc
- Visual comparison of laboratory and observed absorption wavelengths
- Adjustable H₀ values with a distance–recession velocity graph
- Cosmic age estimate based on the inverse of H₀
- Guided missions with reset and next-step controls