Since neutron stars consist totally of neutrons, they are extremely massive and have a density that is hard to imagine. A typical radius and mass for a neutron star are 1.90 x 10³ m and 4.00 x 10²⁸ kg respectively. What is the radius and mass of a neutron star?
1) Radius: 1.90 x 10³ m, Mass: 4.00 x 10²⁸ kg
2) Radius: 4.00 x 10²⁸ m, Mass: 1.90 x 10³ kg
3) Radius: 1.90 x 10³ m, Mass: 1.90 x 10³ kg
4) Radius: 4.00 x 10²⁸ m, Mass: 4.00 x 10²⁸ kg
