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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What's the impact of a Russian debt default?

Russia is poised to default on its foreign debt for the first time since the Bolshevik Revolution more than a century ago, further alienating the country from the global financial system following sanctions imposed over its war in Ukraine.

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