Question.Why does the Moon look golden, copper or “blood-red” during a total lunar eclipse?
A lunar eclipse occurs when the Moon behind the Earth into its shadow. If the Earth has no atmosphere than the Moon would be completely dark. The sunlight is reaching the Moon passes through the Earth’s atmosphere and it is scattered. Shorter wavelengths are more scattered by the atmosphere and thereby the longer wavelengths dominate. This resulting that the light we perceive as red. In addition, the Moon appears depends on dust, water, and other particles are in atmosphere, as well as factors such as temperature and humidity.
NASA. Total lunar eclipse.