Neutron+star

A neutron star is the collapsed core of a massive star that has ended its life in a supernova explosion. The core Weighs 1.5 - 3 times more than our Sun, yet only 20 kilometres across!

These incredibly dense objects produce a beam of radio waves which sweeps around the sky like a lighthouse, often hundreds of times a second.

Radio telescopes receive a regular train of pulses as the beam repeatedly crosses the Earth so the object is observed as a pulsating radio signal.

A **pulsar** //is// a **neutron star**. So called because we receive pulses of radiowaves from it. It **constantly** emits radiowaves - but since it is spinning we receive the signals in bursts. Surprisingly we cannot detect visible light from a pulsar (it is very hot - but also very small).

__Question__

//What happens if the remaining core (after the supernova explosion) is more than 3 times more massive than our Sun?//

__Answer__

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 * A black hole is formed**
 * STABLE STARS QUIZ**