Big shiny balls

What do you think this is? :) Feel free to guess.

I regret a little that I didn’t spend more time taking this photo, as as you can see, it’s not completely centered. But I think sooner or later I will have the opportunity to take it once more, so I will correct that one day :)

Number of exposures: 7; Camera Model: Canon EOS 5D Mark II; Lens: Canon 16-35 mm F2.8;
Focal length: 16 mm; Aperture: 7.1; Middle exposure time: 1/10s; ISO: 100; Tripod used: yes

Where was this photo taken:

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