Zelensky doubles down on ultimatum to Russian ally | Russia-Ukraine conflict

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Only after clearing its debt can Ukraine discuss gas prices with Russia

Published 24 Dec, 2008 17:10 | Updated 24 Dec, 2008 20:10

The Universe has been expanding since the Big Bang, says astrophysicist Alexey Vikhlinin of the Harvard-Smithsonian Center for Astrophysics and the Space Research Institute. The mystery is why it has been expanding with acceleration recently.

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