© NASA/Marc Kuchner and Christopher StarkDust models.
"We're trying to create a new planet search technique, and we're practicing on the solar system," said NASA exoplanet scientist Marc Kuchner, lead author of a paper describing the results in the September 7 Astrophysical Journal.
The cloud of dust comes from the Kuiper Belt, the region beyond Neptune that contains small, icy bodies, including Pluto. These giant snowballs sometimes smack into each other, sending up flurries of ice grains. These tiny clots of ice and minerals get tugged around by the gravitational influence of giant planets, as well as the solar wind and small nudges from sunlight.
Similar clouds of dust has been spotted around several other stars, including Fomalhaut, the first star to have its planets directly photographed. Most extrasolar planets are too dim to have their portraits taken directly, but their presence can warp the disk of dust and debris around their stars into distinctive shapes, telling outside observers the planets are there.
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Aliens do not need any evidence we are here, they have known for thousands of years, there is no way in this or any other universe we can hide ourselves. I do find it annoying when the media use these pointers as though by magic they will suddenly reveal our presence as a species. they have known about us for aeons and have mots probably played a serious hand in genetically engineering us. This is about as certain as it can be without being told outright by these beings.