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A knowledge platform for everything above Earth — astronomy, space, the night sky, celestial events, mythology, and astrology as a clearly separate cultural tradition.

Astronomy is presented as scientific, evidence-based, and sourced. Astrology is presented as cultural, symbolic, and interpretive — never as proven science.

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Understanding Stars

Learning path

Understanding Stars

From what a star is to how stars live and die — a guided path through the star encyclopedia, built on real catalogue data.

Beginner

1.1What is a star?Meet the star encyclopedia: thousands of real stars, each a first-class entity.
1.2Spectral classes & colourWhy stars range from blue to red, and what their spectra reveal.
1.3Brightness & magnitudeApparent vs absolute magnitude, and the brightest stars in our sky.
1.4Distance & the nearest starsHow we measure stellar distances — and our closest neighbours.

Intermediate

2.1Yellow dwarfs like the SunMain-sequence G stars and how the Sun fits in.
2.2Red dwarfsThe galaxy's most common and longest-lived stars.
2.3Binary & multiple systemsMost stars are not alone — how systems form and orbit.
2.4Variable starsStars whose brightness changes, and why.

Advanced

3.1Giants & subgiantsWhat happens when a star leaves the main sequence.
3.2Supergiants & the largest starsColossal evolved stars and the precursors of supernovae.
3.3Blue supergiants & Wolf-Rayet starsThe hottest, most massive, most luminous stars.
3.4White dwarfs — stellar remnantsThe dense cores left when Sun-like stars die.

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