Cosmology is puzzled as to why two methods for measuring the expansion of the cosmos yield different results. A third method ...
A burst of light in the deep sky is doing something it should not be able to do. It looks like one supernova, but it shows up ...
Gravitational lenses could allow us to find black hole binaries long before we're able to measure their gravitational waves.
A lucky alignment of galaxies allowed researchers to identify the most powerful and distant "space laser" ever found.
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