the aurora borealis
noun [ S ] uk/əˌrɔː.rə bɒr.iˈeɪ.lɪs/ us/əˌrɔːr.ə bɔːr.iˈæl.ɪs/ (also the Northern Lights)
北极光
a pattern of differently coloured lights that are sometimes seen in the night sky in the most northern parts of the world
Compare: the aurora australis