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be logical and use common sense. Pulsars are big, nasty, radio-
noisy beasts in the cosmic zoo. They are what's left over after
a massive star (say one that is at least eight times more
massive than the Sun) explodes as a supernova. Some of the
star's body (what hasn't been blasted out to space) falls back
in on itself in a seething mass of crushed neutrons. They're
superdense and they spin. As they whip around many times per
second, they send out beams of radio waves that sweep across our
field of view like the light from a lighthouse. We catch their
beams as pulses of radio waves; hence the name "pulsar." A group
of astronomers who study