These stars are supported against their own gravity by the exclusion principle between neutrons, so they do not collapse into black holes. They are very small, cold, and dense. Certain kinds are called pulsars because they emit pulses of radio waves.
Neutron stars Term Timeline in A Brief History of Time
The timeline below shows where the term Neutron stars appears in A Brief History of Time. The colored dots and icons indicate which themes are associated with that appearance.
...as they contract again. The central portions of the star contract into dense regions, becoming neutron star s or black holes, though this is not yet fully understood. Sometimes outer parts of... (full context)