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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.

Astronomy

Stars
Constellations
Galaxies
Nebulae

Sky Guide

Night Sky Tonight
Moon Phase
Meteor Showers
Solar Eclipses

Astrology

Zodiac Signs
Birth Chart
Natal Chart
Rising Sign

Calculators

Natal Chart Calculator
Zodiac Sign Calculator
Rising Sign Calculator
Moon Sign Calculator

Encyclopedia

Glossary
History of Astronomy
History of Astrology
Ancient Civilizations

Observatory

Image Library
NASA Gallery
ESA Gallery
James Webb

Guides

Beginner Astronomy
How Stars Form
How Black Holes Work
How Telescopes Work

© 2026 Asteria Star. Everything above Earth — science and tradition, kept clearly apart.

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Home
Learn
Learn Stars

Learning path

Learn Stars

From the Sun to supergiants — how stars live, shine, and die.

Beginner

1.1What is a star?A self-gravitating sphere of plasma.
1.2SiriusThe brightest star in the night sky.
1.3Explore starsBrowse named stars in the graph.

Intermediate

2.1How stars formGravitational collapse to fusion.
2.2BetelgeuseA red supergiant nearing its end.
2.3Stars in OrionThe stars of a famous constellation.

Advanced

3.1SupernovaeThe explosive deaths of stars.
3.2ExoplanetsWorlds orbiting other stars.
3.3Black holesWhat some massive stars leave behind.

Related entities

Star
Sirius
The brightest star in the night sky, in Canis Major.
Star
Betelgeuse
Star
Proxima Centauri

Continue learning

Learn Galaxies →Learn Black Holes →