 If you liked
Planetes
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 ...then you might like
Chikyuugai Shounen Shoujo
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The Orbital Children and Planetes have completely different plotlines, but are some of the closest examples of hard science fiction found in a space theme anime. Planetes especially makes an effort to include detailed technical explanations for the viewer to understand. The Orbital Children is more limited due to its total running time, but the plotline is very much driven by hard science fiction ideas. Follow this recommendation to continue humanity's journey into space.
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Recommended by lancelot200
both have an space theme with hard science fiction, particularly in spaceships and space travel, Planetes has more realistic explanations for what is being presented in the anime. Both are also similar on issues such as the future of Earth, humanity, and environmental and geopolitical issues.
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Recommended by IsaacNewton2