Map of gamma-ray pulsars

Fermi Tracks Gamma-ray Pulsars

What spins hundreds of times per second, has 100 trillion times the Sun's density, and spews lethal radiation all over interstellar space? Astronomers are closer to knowing the answers, thanks to NASA's newest deep-space observatory.

X-ray binary

Pulsar on the Fence

Astronomers have discovered a neutron star that switches between X-ray and radio emission within a few days. The find is fabulous news for theorists, who have long predicted that the two pulsar types were connected.