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High-speed gas shooting from the galaxy M87 is causing stars to go nova, a study suggests, and no one knows how.). As the white dwarf’s intense gravity squeezes the gas, it heats up and explodes, but both stars survive the violence. In fact, over millions of years, the same star goes nova again and again.
By dividing the galaxy into 10 equal sectors, the astronomers found that 25 blasts occurred along the jet — versus only 10 to 16 in each of the galaxy’s other sectors. The chance that this is just a statistical fluke is only about 0.3 percent, the researchers say. Perhaps, he says, the jet pushes interstellar gas onto white dwarf stars in nova systems, increasing the amount of material that accumulates on the stars’ surfaces. As a result, the white dwarfs explode more frequently than they otherwise would, accounting for the surplus of nova outbursts along the jet.
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