The Hale Bopp comet, which passed through the inner Solar System in 1997, had a spectacular tail over three million miles long - even though the comet's nucleus* was only 13 kilometres wide.
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The Hale Bopp comet, which passed through the inner Solar System in 1997, had a spectacular tail over three million miles long - even though the comet's nucleus* was only 13 kilometres wide.
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