A “ghostly glow” is surrounding our solar system, scientists say – and they are not sure where it is coming from.

The dim glow continues even when the expected sources of light are subtracted, scientists say. In a new study, they subtracted the light that is coming from known sources – such as stars and galaxies – and found that something remained.

The amount of light is tiny: equivalent to ten fireflies spread out across the whole sky. But scientists are nonetheless perplexed by the glow, and are yet to find exactly where it is coming from.

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Scientists made the discovery using 200,000 images taken from Nasa’s Hubble Space Telescope. They then looked for any background glow by removing all the expected light.

Read more: yahoo