1. airglow; nightglow
Wikipedia definition
2. AirglowAirglow (also called nightglow) is the very weak emission of light by a planetary atmosphere. In the case of Earth's atmosphere, this optical phenomenon causes the night sky to never be completely dark (even after the effects of starlight and diffused sunlight from the far side are removed).
Read “Airglow” on English Wikipedia
Read “大気光” on Japanese Wikipedia
Read “Airglow” on DBpedia


to talk about this word.