As far as I can remember the only piece of Concept Art for Jupiter is the [url=http://www.bungie.net/pubassets/913/europa_desktop.jpg]europa_desktop[/url] which isn't really [i]of[/i] Jupiter. But I suppose the same could be said about the [url=http://www.bungie.net/pubassets/615/cassini_derelict_desktop.jpg]cassini_derelict_desktop[/url].
My point is that we have possibly 7 for Mars if you include [url=http://www.bungie.net/pubassets/755/vault_desktop.jpg]this[/url] and [url=http://www.bungie.net/pubassets/615/pike_desktop.jpg]that[/url], the latter being less likely. And 4 for Venus if you include [url=http://www.bungie.net/pubassets/1177/valley_desktop.jpg]this[/url].
[b]So far Mercury has none that are identifiable[/b]...
Speaking of which, where do you think the above Giant Onyx Pyramid Ships are? Ganymede is my best guess but [url=http://memecrunch.com/image/4fe63d811861330f3400016a.jpg]who knows[/url]?
TL;dr[spoiler]I desire more beautiful works of art. (What's up with Ganymede and Pyramids these days? Right?)[/spoiler]
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Future dlc
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So yeah, Ganymede... Probably in that picture above or something.