BBC Focus Magazine

[M Paul Lloyd]

I might be wrong but, if carbon nano-tubes (or something like them) could exist in a natural form then could they not be having a serious effect on our view of the universe?

Carbon nanotube 'space camouflage' coating invented
Tiny carbon tubes can be used to hide three-dimensional objects from view, according to a team of researchers.
The nanotubes are one-atom thick sheets of graphene wrapped into cylindrical tubes.
Engineers from University of Michigan found they could be used to obscure objects so that they appeared to be nothing more than a flat black sheet.
The team suggest "forests" of the material may one day be used to cloak spacecraft in deep space.
The group says the technology works because the nanotubes' "index of refraction [is] very close to that of air".
This means they slow down light to a similar degree.
As a result there is very little scattering of light as it passes from the air into the layer of nanotubes.

More here
http://www.bbc.co.uk/news/technology-15837145

[Shadowwolf]

Well there was Honeycomb Carbon Crystals Possibly Detected in Space.

Not so sure about nanotubes though as they appear to need manufacturing and thus are unlikely to be found space. Therefore there is as yet no reason to account for effects of what may be. Besides, if they cloaked objects then we would not see them, but one method of inferring dark matter is via gravitational lensing.