Watch the biggest-ever comet outburst spray dust across the cosmos | Live Science

The dust trail from the largest comet outburst ever seen will grace the skies this summer — and it’s going to look like a giant hourglass.

The night show will come courtesy of comet 17P/Holmes, which in October 2007 let off a huge flash of gas and dust, brightening by a factor of a million and briefly becoming the largest object in the solar system. In that brief period, its coma, the dust cloud surrounding the comet body, had a bigger diameter than the sun.

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