[internetcitizen]

Why isn't it red?

[unwind]

My guess would be that it's simply not a color image.

[macey]

Pretty sure Mars looks red because of the atmosphere. The surface isn't actually red. Could be wrong.

[artursapek]

I think you are. https://www.youtube.com/watch?v=4YQBuuhh76A&feature=play...

[_b8r0]

I think you're underselling the video. That is a fascinating presentation on aerial mars exploration.

[artursapek]

It was linked to elsewhere in this thread. I'm just citing it to answer this one misconception.

[kristopolous]

to the rescue: http://en.wikipedia.org/wiki/Mars_surface_color