what is Red Moon?

red moon

 RED MOON:

refraction is responsible for the moon appearing red during a lunar eclipse. a lunar eclipse occur when earth blocks sunlight towards the moons. as a result, you might expect the moon to be completely dark. instead, the light from the sun refracts through the Earth's atmosphere and bends around earth toward the Moon.  

since earth's atmosphere scatters most of the blue and green light. Thus, mostly red light illuminates the Moon, Because the moon reflects most colors of light equally well, it reflects the red light back to Earth, and therefore the Moon appears to be red.