A dying star leaves behind a core of mass MMM. The mass of the Sun is 2.0 × 1030 kg.
Which of the following could be the value of M M\,M if the core is too massive to form a stable white dwarf, but can successfully form a stable neutron star?
2.1×1030 kg2.1 \times 10^{30} \text{ kg}2.1×1030 kg
4.2×1030 kg4.2 \times 10^{30} \text{ kg}4.2×1030 kg
6.8×1030 kg6.8 \times 10^{30} \text{ kg}6.8×1030 kg
1.2×1030 kg1.2 \times 10^{30} \text{ kg}1.2×1030 kg
