What causes X- ray bursters?
A) The binary companion of a neutron star spirals in and combines with the neutron star.
B) The rapid rotation of the neutron star causes it to fly apart.
C) Helium fusion, which occurs when the thin layer of accreted material on a neutron star reaches 100 million K
D) The mass of an accreting neutron star passes a critical threshold between 2 and 3 Msun and explodes.
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