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Pollux
Details
Pollux is the brightest star in Gemini and the nearest giant star to the Sun. It has already left the main sequence and swelled into an orange giant, making it a useful nearby preview of what a Sun-like star looks like after exhausting core hydrogen.
Pollux is one of those stars that seems comfortable at first glance. It is bright, familiar, and easy to find in Gemini. But it is also the nearest giant star to the Sun, which means it is already living in a very different stellar phase from the one our own star currently occupies.
Pollux has left the main sequence and expanded into an orange giant. That change matters because it shows what happens when a Sun-like star exhausts the hydrogen in its core and begins to move into a looser, larger state. Pollux is therefore not just a bright star to admire. It is a nearby example of transformation already in progress.
That is why Pollux works so well in a story about stars. It does not rely on spectacle. Instead, it offers a calm but powerful preview of stellar evolution, close enough to feel personal and unusual enough to be memorable. Pollux is a giant star that turns future into something visible.
4.64million km
Visual creditscaleofspace.org / CC BY-NC 4.0
Key facts
- Category
- Stars
- Object class
- Orange giant star
- Mass
- ~1.9 solar masses
- Temperature
- ~4,810 K surface
- Scale fact
- 12.5 million kmdiameter
- Estimated age
- ~0.9–1.7 billion years
- Composition
- Hydrogen and helium
Scale context
Where Pollux sits on the full axis
By size on the journey, Pollux sits between Spica A and Sagittarius A*. The band below uses nearby Stars objects for context.
Shared physical scale
41.9million km
Together, these objects make the size change around Pollux 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.