AstroLab
The pulse of stars
Three Cepheids, three periods: watch observations become light.
1 min 21 s · Interactive subtitled film
Takeaway: A Cepheid’s repeated luminosity variation differs from twinkling.
Useful background
None; brightness and cycles are explained.
How can a variable star help measure distance?
The journey · 2 chapters
- A star that really changes
- Back to the measurements
Why explore it?
French and English subtitles. Adjustable playback speed, free navigation and sequence reframing. AI-assisted editorial review.