structural:expansion, stylistic:tone
Blood moon

Certain lunar eclipses have been referred to as "blood moons" in popular articles but this is not a scientifically recognized term. This term has been given two separate, but overlapping, meanings.

The meaning usually relates to the reddish color a totally eclipsed Moon takes on to observers on Earth. As sunlight penetrates the atmosphere of Earth, the gaseous layer filters and refracts the rays in such a way that the green to violet wavelengths on the visible spectrum scatter more strongly than the red, thus giving the Moon a reddish cast. This is possible because the rays from the Sun are able to wrap around the Earth and reflect off the Moon.