aurora borealis
noun🔊/əˌrɔːrə ˌbɔːriˈeɪlɪs/
🔊/əˌrɔːrə ˌbɔːriˈælɪs/
[singular] (also the Northern Lights [plural])
bands of coloured light, mainly green and red, that are sometimes seen in the sky at night in the most northern countries of the world 北极光