After the sudden outburst in 2007, the coma of comet 17/P Holmes became temporarily wider than the sun.

Debris from most spectacular outburst might explain perplexing comet behavior

Debris from the most spectacular comet outburst ever is visible from Earth this month and astronomers hope the observations might shed some light on the puzzling event that brightened up the sky in 2007.

When the faint Comet 17P/Holmes erupted with the brightest cometary burst ever observed in October 2007, astronomers watched in awe. It wasn’t the first time this underwhelming 2.1-mile-wide (3.4 kilometers) come did it. In fact, the ice ball was only discovered thanks to a similar outburst in 1892.

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