A binary star. A has novaed and become a neutron star. B is a red dwarf. A, retaining most of its mass and gravity, draws matter from B. A bridge, river or cataract of hydrogen gas joins A and B. Condensed by weight and heated by its fall, the hydrogen periodically explodes into another nova. The cycle will end eventually and might culminate in a Type 1 supernova followed by a black hole.
Poul Anderson shows cosmic events as dramatic.
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