Hubble identifies unusual wrinkle in expansion rate of the universe

A collection of images from the NASA/ESA Hubble Space Telescope features galaxies that are all hosts to both Cepheid variables and supernovae. (Source: NASA / ESA  / Adam G. Riess (STScI, JHU) via CNN) A collection of images from the NASA/ESA Hubble Space Telescope features galaxies that are all hosts to both Cepheid variables and supernovae. (Source: NASA / ESA / Adam G. Riess (STScI, JHU) via CNN)

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Russia strikes Kyiv as Western leaders meet in Europe

Russia shattered weeks of relative calm in the Ukrainian capital with long-range missiles fired toward Kyiv early Sunday, an apparent Kremlin show-of-force as Western leaders meet in Europe to strengthen their military and economic support of Ukraine.

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