Why don't all supernova remnants contain pulsars?
A) All supernova remnants do contain pulsars.
B) Some supernova explosions form white dwarfs instead of the neutron stars necessary for pulsars.
C) Pulsars slow down and quit producing the pulses before the supernova remnant dissipates.
D) The pulsar may be tipped so that the beams do not sweep past Earth.
E) b and c above.
Correct Answer:
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