A sunspot 7 times the size of Earth could spark aurora as far south as Michigan, New York, and Pennsylvania this Friday

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A stunning aurora may be visible farther south than usual this Friday, lighting up the northern US. That's thanks to an overactive, giant spot seven times the size of Earth that's erupting on the sun. Northern border states from Washington to Michigan are most likely to see the aurora Friday night. Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. download the app Email address Sign up By clicking “Sign Up”, you accept our Terms of Service and Privacy Policy . You can opt-out at any time. Advertisement The Northern Lights are forecast to reach farther south than usual this Friday, dazzling the northern US. Typically, the best time to see aurora is between 10:00 p.m. and 2:00 a.m. local time, because this is when it will be the most active, according to the National Oceanic Atmospheric Administration. We mainly owe this spectacle to a giant, hyperactive sunspot called AR3664 that's seven times the size of Earth and has been producing powerful eruptions, called coronal mass ejections, for the last several days. This story is available exclusively to Business Insider subscribers. Become an Insider and start reading now. Have an account? Log in .