The Clue ___ borealis
The Answer AURORA
The term "aurora borealis" refers to the natural light display seen in the northern skies, often called the Northern Lights. The word "aurora" means dawn in Latin, which fits well with the idea of bright lights appearing in the night sky. This answer matches the crossword clue perfectly, as it completes the phrase. Additionally, "aurora" is commonly associated with beautiful, colorful lights, making it a well-known term.