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Although humans can't see them, radio waves are a form of light in the sense that they are part of the electromagnetic spectrum, which also includes X-rays and gamma rays.

The gamma rays detected on Earth tell us a great deal about these sources, since they travel through space undisturbed.

Astrophysicists at the University of California, Berkeley, now argue that the axion could be discovered within seconds of the detection of gamma rays from a nearby supernova explosion.

Light that reaches our telescopes ranges in wavelength from long radio waves to energetic gamma rays.

The research team were simultaneously monitoring a source of gamma rays and seeking a fast radio burst when they spotted the object slowly flashing in the data.