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Aldebaran
Details
Aldebaran is a red giant branch star in Taurus with a cool orange surface and a diameter about 45 times the Sun’s. It lies in front of the Hyades cluster by chance, so it appears to sit among the bull’s-head stars without actually belonging to that group.
Aldebaran is one of the easiest stars to notice in Taurus, but what it seems to be and what it actually is are not the same thing. It is a red giant with a cool orange surface, a star that has already expanded beyond the Sun-like stage and now looks like a warm ember in the sky.
The interesting twist is its apparent neighborhood. Aldebaran appears to sit among the Hyades cluster, yet it is not really part of that group at all. It is a foreground star that happens to line up with the cluster from our point of view, which makes it a natural lesson in how perspective can mislead even when the sky looks perfectly orderly.
That is why Aldebaran matters. It is a star that teaches without trying to. It shows how a bright object can belong to one physical story while seeming to belong to another. Aldebaran is proof that the sky is full of arrangements, and not every arrangement is a real family.
23.3million km
Visual creditscaleofspace.org / CC BY-NC 4.0
Key facts
- Category
- Stars
- Object class
- Red giant branch star
- Mass
- ~1.03 solar masses
- Host
- Aldebaran system
- Scale fact
- 62.8 million kmdiameter
- Estimated age
- ~6.4 billion years
- Composition
- Hydrogen and helium
- Temperature
- ~3,900 K surface
Scale context
Where Aldebaran sits on the full axis
By size on the journey, Aldebaran sits between Arcturus and Polaris Aa. The band below uses nearby Stars objects for context.
Shared physical scale
182million km
Together, these objects make the size change around Aldebaran 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.