Astronomers using the Zwicky Transient Facility have discovered two white dwarfs orbiting each other every 6.9 minutes. But there is nothing transient about the gravitational waves emitted from this binary: the stars will produce persistent ripples in spacetime for millennia.
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images in a, NASA/Dana Berry, Sky Works Digital.
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Hermes, J.J. The plunging pirouette of two low-mass stars. Nat Astron 3, 690–691 (2019). https://doi.org/10.1038/s41550-019-0863-3
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DOI: https://doi.org/10.1038/s41550-019-0863-3
