Physicists have taken the Universe’s temperature, revealing the searing trillion-degree heat of the Big Bang’s first plasma.

George W. Bush made hydrogen his baby back in the early 2000's, but this alternative fuel could still have its day in the sun ...

The record-setting heat that Tucson and much of Arizona experienced this summer is a red flag — a warning of things to come, experts say. Continued global climate change and the worsening of the urban ...