Is a neutron star as hot as the star it's made of?

Normal stars can have a temperature in the range of 3500 to 60,000 kelvin on its surface with the hottest being the blue supergiants. The temperature inside a newly formed neutron star is from around 100,000,000,000 to 1,000,000,000,000 kelvin. read more

A neutron star is so dense that one teaspoon (5 milliliters) of its material would have a mass over 5.5 × 10 12 kg, about 900 times the mass of the Great Pyramid of Giza. In the enormous gravitational field of a neutron star, its weight would be 1.1 × 10 25 N, which is about 15 times the weight of the Moon. read more

The matter found in the neutron star’s very center (called inner core) is known as cold ultra-dense matter and its composition is currently unknown. Poorly understood properties of the strong force do indeed affect our understanding of matter at those extraordinary densities (see e.g., “Rethinking Neutron Stars“). read more