Arcturus: how big is it?
Arcturus is about 35 million km. In everyday terms, that is ≈ 25.2 Suns.
- Size
- 35 million km
- In metres
- 3.50 × 10¹⁰ m
- Everyday comparison
- ≈ 25.2 Suns
- Chapter
- Stars
Did you know?
An orange giant 37 light-years away — a preview of what our Sun will become in about 5 billion years.
How it compares
- About 1.5× bigger than Sagittarius A* (black hole) (24 million km).
- About 4.3× smaller than Earth → Sun distance (150 million km).
Other things of a similar size
- Earth → Moon distance 384,000 km
- The Sun 1.39 million km
- Sirius 2.38 million km
- Sagittarius A* (black hole) 24 million km
- Earth → Sun distance 150 million km
- Betelgeuse 1.06 billion km
Sizes are rounded, typical values drawn from standard reference sources, including NIST/CODATA physical constants and NASA's planetary fact sheets. Real objects vary; see About for how sizes are chosen.