 FACT: There are a number of errors; the pulsars approaching Earth  are depicted as cylinders, with a visible rotation. In reality, the  gravity field of a pulsar, also known as a neutron star, is so  strong (not quite enough to be a black hole) that it can only be  spherical in shape. Pulsars were spoken of as theoretical  constructs, not only by the people of the doomed world, but by  Arturo and Quinn; in this world, presumably the Sliders home,  pulsars were first identified in 1957. The plaque on the Voyager  probe shows the location of Earth relative to pulsars. Even though  their bodies are small, pulsars are so massive (an asteroid