"Cosmic Microwave Background"

We had a brilliant professor from Stonybrook University as our speaker tonight and she gave an amazing talk about observatories being built to explore the Cosmic Microwave Background.  She is the principal investigator of a new one under construction in the Atacama desert in Chile.  She made some complex concepts more easily understood. The "CMB" is microwave radiation that fills all space in the observable universe. With a standard optical telescope, the background space between stars and galaxies is almost completely dark. However, a sufficiently sensitive radio telescope detects a faint background glow that is almost uniform and is not associated with any star, galaxy, or other object. This glow is strongest in the microwave region of the electromagnetic spectrum. The CMB is the key experimental evidence of the Big Bang theory for the origin of the universe.  So why is this photo in black & white?

This is what the original photograph looked like.  Why is it all yellow green?  This light is from the digital projector in the ceiling.  Because it is a color digital projector it doesn't transmit white light.  I think at high speed it rapidly creates an image using red, green, or blue light. So when my camera shutter goes off, the camera may be capturing only one of the three colors in the moment it was displayed.  I thought that when I converted the color to black and white, the image was more attractive. 

So try and figure out this photograph which has the correct color.  The speaker and the group are illuminated by the light of the screen where the photographs and charts are projected. But for some reason, all the photographs like this one have the correct color.  I am at a loss.  Life is complicated!