[{"question":"What causes a pulsar to form?","choices":["The collapse of a quasar.","A supernova.","When two comets collide head-on."]},{"question":"The rotation rate of pulsars slows down with age.","choices":["True","False"]},{"question":"When was the first pulsar discovered?","choices":["1888","1967","1991"]},{"question":"Pulsar is short for \"pulsating radio star\", or just \"pulsating star.\"","choices":["True","False"]},{"question":"The first extrasolar planets were discovered around a pulsar.","choices":["True","False"]},{"question":"The discovers of the pulsar, Jocelyn Bell Burnell and Antony Hewish, nicknamed the signal LGM-1, short for \"little green men.\"","choices":["True","False"]},{"question":"Observations of a pulsar in a binary system with another neutron star provided the first ever evidence of the existence of _____.","choices":["dark matter","black holes","gravitational waves"]},{"question":"The three classes of pulsars are rotation-powered pulsars, accretion-powered pulsars, and _____.","choices":["vexars","magnetars","extranovas"]}]