Massachusetts July 10, 2023 10:26 am What are the northern lights? The Northern lights, also called an aurora borealis, are moving waves of lights seen in the night sky. US & World Videos 4:04 Forecast: Sunday looks gorgeous 2:47 Boston hotel workers say they want to be able to afford to live in the city 3:25 Aurora forecast: Saturday night will be weekend's best chance to see northern lights 2:09 Crowds flock to Salem for early Halloween fun 2:13 Boston hotel workers prepare to strike again — this time until there's a new contract