Those that spin rapidly, called pulsars, emit regular pulses of radio energy many times a second.

Such stars are called pulsars because, from Earth's vantage point, they appear to pulse.

For this reason, millisecond pulsars are sometimes called recycled pulsars.

Natural occurring sources of pulsed radiofrequency exist in the form of stars called pulsars.

This 'pulse' is why they are called pulsars.

Neutron stars which emit such pulses are called pulsars.

Supernovas sometimes leave behind dense spinning neutron stars called pulsars.

Theorists say these beacons, called pulsars, are the spinning corpses of burned-out stars.

Such neutron stars are called pulsars, and were the first neutron stars to be discovered.

Some neutron stars, spinning rapidly, emit pulsating radio signals, and so are called pulsars.