Given that these images are infrared, that wouldn't be much.

Besides the wavelength being outside of human perception, an astronaut wouldn't see anything due to the low photon flux. These pictures have a very high exposure time.

just bring it up in an editor and drop the saturation to zero. That will take it back to a luminance map image.

You have 2 choices for these images, false colour or black and white. Anything else is false.