"Alien base" on Mars?

Is this a structure of some sort spotted on Mars by the Mars Rover Spirit?

Interestingly the ‘Spirit Front Hazcam 2169‘ images have been removed by NASA at this time on their website. Are they hiding something? What do you think?

Spirit: Rear Hazcam :: Sol 2169





http://marsrovers.jpl.nasa.gov/gallery/all/spirit_r2169.html
http://marsrovers.jpl.nasa.gov/gallery/all/spirit.html
http://deathby1000papercuts.com/2010/12/ufo-base-on-mars-bizarre-nasa-mars-exploration-rover-photo/

It's not a structure. It's a part of the rover itself.

Check this out:

I don't know.It doesn't see to me that this is a part if rover,because it's to big to be part of the rover..

Of course it would be much easier to recognize if the picture would be in color but it's the solar sail which is right above the camera:

http://de.academic.ru/pictures/dewiki/109/mars_spirit.jpg

http://www.newfrontiernews.com/wp-content/uploads/2009/08/Spirit-Rover.jpg

Still it doesn't prove anything..It could be anything.It's a matter of what you believe...