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Proxima Centauri
Details
Proxima Centauri is the nearest known star to the Sun, just over four light-years away. ESA describes it as a flare star prone to dramatic brightening, yet because it burns fuel so slowly it may remain on the main sequence for another four trillion years.
Proxima Centauri is the nearest known star to the Sun, but it is not a star that dominates the sky. It is a red dwarf: small, dim, and easy to miss unless you know exactly where to look. That makes Proxima feel less like a spotlight and more like a quiet but persistent ember.
At the same time, Proxima is not gentle in the everyday sense. It is a flare star, so its brightness can jump suddenly, and its surface is restless enough to keep astronomers alert. Yet the same slow-burning nature that makes it faint also makes it extraordinarily long-lived. Proxima can spend trillions of years on the main sequence, outlasting stars like the Sun by a vast margin.
That combination is what makes Proxima compelling. It shows that the closest star to us is not a miniature Sun but a different kind of engine altogether. Proxima turns the idea of a nearby star into something stranger: a small, active, durable source of light.
79,857km
Visual creditscaleofspace.org / CC BY-NC 4.0
Key facts
- Category
- Stars
- Object class
- Red dwarf star
- Mass
- ~0.12 solar masses
- Host
- Alpha Centauri system
- Scale fact
- 215,000 kmdiameter
- Estimated age
- ~4.8 billion years
- Composition
- Hydrogen and helium
- Temperature
- ~3,000 K surface
Scale context
Where Proxima Centauri sits on the full axis
By size on the journey, Proxima Centauri sits between Jupiter and 61 Cygni A. The band below uses nearby Stars objects for context.
Shared physical scale
1.85million km
Together, these objects make the size change around Proxima Centauri easy to compare at a glance.
Between the smallest and the largest, perspective is everything.
About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.