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Part of the reason scientists have settled on the Big Bang theory as the best explanation of how the Universe came into being is because of an 'afterglow' it emits – but a new study suggests we may need to rethink the source of this faint radiation.

Technically, this afterglow is known as Cosmic Microwave Background (CMB) radiation, and it's been traveling through space for more than 13 billion years, since soon after the Big Bang first went bang. It can be picked up by our most advanced telescopes.

Now, researchers from Nanjing University in China and the University of Bonn in Germany have run calculations suggesting we've overestimated the strength of the CMB. In fact, it might not even be there at all.