Smallest stars
- Who
- Neutron stars
- What
- 10–30 kilometre(s)
- Where
- Not Applicable (Query)
- When
- 01 January 0001
Neutron stars, which may have a mass up to three times that of the Sun, only have diameters of 10–30 km (6–19 miles).
Neutron stars are also the densest stars in the universe. A sand-grain size of neutron star material would have the mass of a skyscraper.