Spooky! Rare blue moon to appear on Halloween

Halloween will be a little more spooky than usual this year.The sky will be lit by a blue moon – the second full moon in that month.This will also be the first blue moon in the United States since March 2018, according to to NASA's National Space Science Data Center.Despite its name, a blue moon is not necessarily blue.The phrase "once in a blue moon" usually means a rare occurrence that can either be lucky or unlucky.So, if you experience something weird this Halloween, you can chal