The Milky Way glows over the Sweetgrass Hills of Montana. (Image credit: Alan Dyer/VWPics/Universal Images Group via Getty Images) The moonless nights of mid-May are a fantastic time to spot the glowing band of the Milky Way arching across the spring sky, before the encroaching twilight of the summer months shortens the viewing window. When is the best time to spot the Milky Way? Each Core Season has peak windows of visibility centering around the monthly new moon. This month's new moon on May 16 will provide darker skies ideal for spotting our galaxy's glowing core. The best time to see the Milky Way's core is between midnight and dawn, when the ribbon of interstellar dust, gas and countless stars is at its highest in the night sky. The May new moon also provides a longer window for viewing the deep sky wonder compared to the June new moon, which occurs close to the summer solstice , when twilight eats further into the dark of night.…