The Pioneer 10, Pioneer 11, Voyager 1, and Voyager 2 space probes each have a symbolic depiction of the location of our solar system relative to 14 of these objects. Burnell & Hewish discovered the first of these in 1967, and called the signal from the first "LGM-1", since they could not discount the possibility that this was a signal from "Little Green Men". Aleksander Wolszczan discovered the first extrasolar planet orbiting one of these bodies. Identify these types of neutron star, one of which can be found at the center of the Crab Nebula.
Pulsars