Many pulsars have periods that are gradually getting longer as the spinning neutron stars lose energy.

Question

Quizplus · Accepted Answer

This is correct. Pulsars are spinning neutron stars that emit radiation in narrow beams, and they gradually lose energy over time. As they lose energy, their periods (the time it takes for them to complete one full spin) get longer. This phenomenon is known as "spin-down," and it has been observed in many pulsars.

Many Pulsars Have Periods That Are Gradually Getting Longer as the Spinning