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Explanation: How does a comet tail change? It depends on the comet. The ion tail of Comet 12P/Pons–Brooks has been changing markedly, as detailed in the featured image sequenced over nine days from March 6 to 14 (top to bottom). On some days, the comet's ion tail was relatively long and complex, but not every day. Reasons for tail changes include the rate of ejection of material from the comet's nucleus, the strength and complexity of the passing solar wind, and the rotation rate of the comet. Over the course of a week, apparent changes even include a change of...

Scientists are reporting that a “horned” comet three times bigger than Mount Everest is hurtling toward Earth after encountering a large explosion. The blast originated on October 5 from 12P/Pons-Brooks a cryovolcanic — or cold volcano — comet. According to Live Science, the comet, nicknamed the “Devil” due to its apparent horns, measures a colossal 18.6 miles in diameter, or the size of a small city. For reference, Mount Everest, the highest mountain on Earth, is about 5.5 miles high. This marked the second time this interstellar ice cube erupted in the last four months. The Science Times reports that...