Astronomers find youngest known magnetar

NASA and ESA discovered a neutron star, Swift J1818.0-1607, born from a supernova visible 240 years ago. This neutron star is a rare magnetar, located 16,000 light years away in Sagittarius. It is 1,240 years old, with twice the Sun's mass in a 25 km diameter. Magnetars are powerful magnetic objects and a type of pulsar, emitting radiation due to misaligned rotation and magnetic axes.

What is the name of the neutron star discovered by NASA and ESA?

How long ago was the supernova that led to the formation of the neutron star visible from Earth?

What is a magnetar and how does it differ from a regular neutron star?

Describe the significance of the neutron star's mass and size.

What causes the pulses of high energy radiation observed from a pulsar?