Yes. Here are fact checks for those who don't trust the easy AI answer: https://www.britannica.com/science/pulsar https://www.britannica.com/science/pulsar ht

Yes. Here are fact checks for those who don't trust the easy AI answer: https://www.britannica.com/science/pulsar https://www.britannica.com/science/pulsar https://en.m.wikipedia.org/wiki/Magnetar#Description https://en.m.wikipedia.org/wiki/Magnetar#Description They are both forms of neutron stars, which average around 20km but are the densest objects known to man. Fun fact, one sugar cube of their material would weigh about as much as a mountain (https://imagine.gsfc.nasa.gov/science/objects/neutron_stars1.html https://imagine.gsfc.nasa.gov/science/objects/neutron_stars1...).