That's the approximate radius of a neutron star, a.k.a. a pulsar.
A circle with a radius of 1.8 km has a circumference of 11.31 km
radius = 48/2 = 24 km
Radius = approx 6050 km, so diameter = 12100 km.
A sphere with a radius of 687 km has a volume of 1,358,184,658.3 km3
C = 31.4 km
It has a radius of between 0.15 and 0.20 that of our Sun. The Sun has a radius of about 696,000 km, so Barnard's Star has a radius of between 104,400 km and 139,200. Average about 121,800 km
Neutrons star is the same size of a city. This is 10 km radius.
The diameter of the vega is 4315000 km
The largest known star "VY Canis Majoris" has a 987,600,000 km radius whereas the sun only has a puney 695,500 km radius.
The smallest object that can reasonably be called a "star" is a neutron star, which is pretty small but still much, much larger than a grape, at about 10-12 km radius.
The sun has a radius of approx 696,000 kilometres. By way of comparison, the earth's radius in 6,371 km.
Mean radius = 3390 km Equatorial radius = 3396 km Polar radius = 3376 km.
Spica has a radius of about 5,150,400 km whereas the Sun has a radius of 696,000 km. So the "Spica Sun" would extend another 4,454,400 km into the Solar System.
Jupiter is not a perfect sphere: it bulges out at its equator.The polar radius is 66854 kmThe equatorial radius is 71492 kmThe average radius is 69911 km.
2.5559 x 10^4 km
The equatorial radius is 71,492 km. The polar radius is 66,854 km
A circle with a radius of 1.8 km has a circumference of 11.31 km