A mysterious 'ghostly glow' equivalent to 10 fireflies has been found around our that persists even when other light sources like stars and planets are subtracted.The discovery was made when astronomers set out to see just how dark space can be, which they did by sifting through 200,000 images snapped by 's Hubble Space Telescope and eliminating the expected glow - but a tiny excess of light prevailed.Scientists cannot be sure where the light is coming from but hypothesize the source sphere made up of dust from comets, which is reflecting sunlight.
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