 If you liked
Planetes
|
 ...then you might like
Ginga Eiyuu Densetsu
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If you came more for space stuff, try out Planetes. Not similar plot wise, but it's another space show. Both of them also deal with moral questions and problems that face society today. For example, there's the issue of whether human's should leave the cradle that is their home planet Earth, governments, companies, whether dreams can motivate or destroy you, etc. So if you're looking for something about space and thought-provoking, Planetes is a great option.