Directory · Galaxies

Galaxies

Our home galaxy and its nearest large neighbour. Each field note covers what we measure, what we still model, and where to read the original research.

Galaxy & nearest star

The Milky WayGalaxy field noteOur barred spiral home: 100,000 light-years across and at least a hundred billion stars. The Andromeda GalaxyGalaxy field noteOur nearest large galactic neighbour, 2.5 million light-years away, heading toward us.
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The wider universe

Follow the Universe timeline from the Big Bang to today, or browse the Systems directory for the Solar System and Proxima Centauri.