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Scientists Discover Evidence of Cosmic Climate Change
Astronomers measured the temperature of the gas that lies in between galaxies, and found a clear indication that it had increased steadily over the period from when the universe was one-tenth-to-one quarter of its current age.
This cosmic climate change is most likely caused by the huge amount of energy output from young, active galaxies during this epoch.
"Early in the history of the universe, the vast majority of matter was not in stars or galaxies", said George Becker of the University of Cambridge.
"Instead, it was spread out in a very thin gas that filled up all of space."
"The gas, which lies between us and the quasar, adds a series of imprints to the light from these extremely bright objects and by analyzing how those imprints partly block the background light from the quasars, we can infer many of the properties of the absorbing gas, such as where it is, what it's made of, and what its temperature is.
"Just as Earth's climate can be studied from ice cores and tree rings, the quasar light contains a record of the climate history of the cosmos
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