Cant figure out wall picture theme to search for.?

Hey, my friend has a picture on his wall for a few years now and i find it really interesting and somehow cool. I am currently decorating my own bedroom and i would like to get myself a similar one to fill out the blank spaces on the walls. 

However i have no idea how to categorize the theme in the picture. It's like some outer worlds or whatever, and i am having hard time finding anything useful with that search on ebay and amazon. 

Is there any "art theme code" or something for a picture like that which would help me find a similar picture on websites ?

I would truly appreciate any suggestions, Cheers.

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