A SPIRAL COMET: Astronomers are monitoring Comet 12P/Pons-Brooks as it approaches the sun for a close encounter in April. Several amateurs have noticed something strange about the comet’s core: It’s a spiral. Full story @ Spaceweather.com.

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Above: The spiral core of Comet 12P/Pons-Brooks photographed by Jan Erik Vallestad of Sunnfjord, Norway