Blood moon. The reason why the Moon takes on a reddish color during totality is a process called Rayleigh scattering. This is the phenomenon responsible for the sky to be blue and the sun to appear yellow.
This is a deep image of the Sword of Orion - the three stars that make up the weapon hanging off the belt of this famous celestial hunter. The image showcases the amazing mix of physical and optical processes including atomic emission, Rayleigh scattering, reflection and absorbtion of light, that go on in this star forming region to create this kaleidescope of colours and details.
Rayleigh Scattering: In the air, there are many tiny molecules, so small we cannot see them with our bare eyes. On a clear day, sunlight passing through the atmosphere is scattered by air molecules. I.e. Rayleigh Scattering.
Rayleigh Scattering by Brett_G via http://ift.tt/2ov3PPG