The colour of the universe is …..
Astrophysicists Karl Glazebrook and Ivan Baldry took light measurements from more than 200,000 galaxies, broke them down into their constituent colours and then averaged the colours out to produce a single shade visible to the human eye. The result was beige. See http://www.guardian.co.uk/theguardian/2009/nov/04/pass-notes-the-universe
Staying on the space theme, One week ago, the MESSENGER spacecraft transmitted to Earth the first high-resolution image of Mercury by a spacecraft in over 30 years. MESSENGER’s Wide Angle Camera is equipped with 11 narrow-band color filters, in contrast to the two visible-light filters and one ultraviolet filter that were on Mariner 10’s vidicon camera. By combining images taken through different filters in the visible and infrared, the MESSENGER data allow Mercury to be seen in a variety of high-resolution color views not previously possible. MESSENGER’s eyes can see far beyond the color range of the human eye, and the colors seen in the accompanying image are somewhat different from what a human would see.
The color image was generated by combining three separate images taken through WAC filters sensitive to light in different wavelengths; filters that transmit light with wavelengths of 1000, 700, and 430 nanometers (infrared, far red, and violet, respectively) were placed in the red, green, and blue channels, respectively, to create this image.