Kieran
Paranormal Adept
SPACE.com -- Coloring the Universe: Why Reality is a Gray Area in Astronomy
That article explains how the data that comes from Hubble is black and white data. Anyway, the article could be wrong - I don't know. What I do know is that NASA is not hiding a civilization with access to oceans on Mars.
I haven't enough time to research this. But a quick search does seem to confirm your correct. There is no "Natural colour" cameras aboard Hubble. The images taken by Hubble are grayscale pixels. The images are downloaded in Black and White.
But that opens another enquiry. If the images of the planet MARS are in Black and White and devoid of Colour. How can you tell. What is the exact colour. Did Viking take Colour photos or black and white Photos Angel?