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The CMB was first spotted by American radio astronomers Robert Wilson and Arno Penzias in May 1964 as microwave radiation in all directions of the sky over Earth. Related: What is the cosmic microwave background?Īs the universe expanded in the subsequent almost 13.8 billion years, these photons lost energy and now have a uniform temperature of a chilling minus 454 degrees Fahrenheit (minus 270 degrees Celsius). The CMB is made up of these first free-travelling photons. The universe effectively went from being opaque to transparent in an instant, allowing the first light to travel.

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The sudden lack of free electrons meant that photons, particles of light, were no longer endlessly scattered by these negatively charged particles. Before this, the universe had been a hot, dense soup of free electrons and protons through which light could not travel.Īround this time, however, the universe cooled enough to allow electrons and protons to join together to form primordial atoms. The CMB represents the oldest light in the universe and is a cosmic fossil left over from an event that occurred around 380,000 years after the Big Bang.

This new mysterious gamma-ray feature may be akin to a peculiar characteristic of the cosmic microwave background (CMB). Cosmic fossil hunt led to gamma ray suprise

These ultra-high-energy cosmic rays (UHECRs) carry more than a billion times the energy of gamma rays, and their origins remain one of the biggest mysteries in astrophysics - a mystery that the discovery of this gamma-ray source deepens.

The team thinks the newfound signal is related to these high-energy particles, or cosmic rays, which are made up mostly of protons, neutrons and atomic nuclei.

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