Transcript: Neutron stars are truly remarkable objects. Think of something with the mass of the Sun, normally one and a half million kilometers across, compressed down to the size of a small asteroid, about twenty kilometers across. Conservation of angular momentum dictates that when a star collapses to this small size its rotation speed will increase. The surfaces of neutron stars are probably rotating at ten to twenty percent of the speed of light. Magnetic fields normally thread stars, and when a star collapses those magnetic fields will be squeezed and strengthened. Astronomers speculate that the surface magnetic field of neutron stars can exceed a trillion Gauss. This is a field-strength a million times greater than any magnetic field produced on the Earth. You can think of a neutron star as a gigantic atomic nucleus with an atomic number of 1057. For three decades theorists had predicted neutron stars, but astronomers could do no thing to detect them and could only speculate that they existed.