( ( ( This type ) ( of ( neutron star ) ) ) ( ( is ( known ( as ( a ( gamma-ray pulsar ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (NN type)) (PP (IN of) (NP (NN neutron) (NN star)))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT a) (JJ gamma-ray) (NN pulsar))))) (. .)))
This type of neutron star is known as a gamma-ray pulsar.
(ROOT (S (NP (NP (JJ Radioactive) (NNS atoms)) (, ,) (NP (JJ nuclear) (NNS explosions)) (, ,) (CC and) (NP (NNS stars))) (VP (VBP produce) (NP (NN gamma) (NNS rays)))))
Radioactive atoms, nuclear explosions, and stars produce gamma rays