As galaxy clusters form, they create clouds of hot electrons.
ECONOMIST: Cosmology
Gas clouds in the middle of the galaxy are, everyone agrees, partly ionised: radiation flying through has battered electrons off some of the atoms in the gas.
ECONOMIST: Here be serpents
Try as they might astronomers simply cannot see through these clouds to the centre of our Milky Way galaxy.
BBC: By BBC News Online Science Editor Dr David Whitehouse
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