On Nov 8, 2014, at 2:26 PM, Greg Chalik <xxxxxx@gmail.com> wrote:

> This article talks about telescope filters
>
> I wonder if anyone could offer a better explanation of why the colour is as depicted in the image
>
> Thank you in advance

Hubble (IIRC) only captures images in monochrome; this allows astronomers to use filters that only capture the part of the spectrum that they wish to study. (this is true of most astronomical imaging systems)

Normally the full color images are created by combining images through red, blue and green filters, in this case, the R filter was not used, but one that captures near-infrared, so the red element of the photo is missing, allowing the blue and green colors to predominate.

--
Bruce Johnson

"Wherever you go, there you are." B. Banzai, PhD