Determine the density of the white dwarf Sirius B if it is known that its radius is 3 times the radius of the Earth

Determine the density of the white dwarf Sirius B if it is known that its radius is 3 times the radius of the Earth, and its mass is almost equal to the mass of the Sun.

Radius R = (6.37 * 10 ^ 6 m) * 3 = 1.911 * 10 ^ 7 m
Mass M = 2 * 10 ^ 30
Density = M / (4/3 * pi * R ^ 3) = 2 * 10 ^ 30 / (4/3 * pi * (1.911 * 10 ^ 7) ^ 3) = 68.4 million kg / m3

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.