What did you change in the model?
Labs / Astronomy
Blackbody Star Color
Every star glows as a blackbody, so its color is a thermometer. Drag the temperature slider (or grab a real star) and watch the disk change hue while the emission curve slides across the spectrum. The dashed marker is the peak wavelength & its color; the readouts track how hot, how blue, and how bright the star becomes.
Labs / Astronomy / Blackbody Star Color
Blackbody Star Color
Every star glows as a blackbody, so its color is a thermometer. Drag the temperature slider (or grab a real star) and watch the disk change hue while the emission curve slides across the spectrum. The dashed marker is the peak wavelength & its color; the readouts track how hot, how blue, and how bright the star becomes.
Why it matters
Why explore this?
Astronomy uses patterns in light and motion to explain objects we cannot touch directly. This model lets you change one part of a space system and see what the evidence would look like.
Explore
Try the model
T 5,778 Kλpeak 502 nmcolor yellow-whiteflux 63.2 MW/m²
Investigate
Questions to test
Predict first, try it in the model, then use what you observe to answer.
What to try
- Why does a hotter star look blue while a cooler one glows red — isn't red the "hot" color on a stove?
- At what temperature does the peak wavelength leave the visible band and slip into the ultraviolet?
- The Sun peaks around 500 nm (green-ish). So why doesn't the Sun look green?
- Double a star's temperature. Does the flux double, or does Stefan-Boltzmann make it jump much more?
- Betelgeuse and Spica differ by a factor of about six in temperature — how differently do their curves and colors look?
Explain
Make sense of what happened
Look for a cause-and-effect rule: what did you change, what responded, and what stayed the same? Astronomers use those patterns to infer how distant systems work.
Check
Before you leave
What visible evidence changed?
What rule could explain that change?
If you can answer all three using evidence from the model, you understand the main idea. If not, return to Explore and change one setting at a time.