How do scientists measure the temperature of the Universe?
SCIENCEALERT STAFF 6 JUN 2014
Image: Swinburne University of Technology
The Universe used to be thousands of degrees Celsius hotter. But how do researchers measure the temperature of objects millions of light-years away to work that out?
Alan Duffy, an astronomer from Swinburne University of Technology, explains how it works in this mind-blowing video. It's like time travel, but with a thermometer.
The video also offers one of the best explanations of stars' colour-changing heat that we've seen.