18 [Similar Anime] Like Astra Lost in Space

This is basically Kanata no Astra but with actual character development, a more accurate world setting and has a more intriguing plot to follow where the characters need to face real problems in order to get back to civilization. In Kanata no Astra this is made too easy, they're literally just traveling in a straight line; I'm enjoying the show for what it is, but Uninhabited Planet Survive is a deeper well-crafted story when it comes to this genre of anime.

Although the two shows feature different settings and genres, the two shows are about groups of people making a journey who end up stranded with someone who shouldn't be there, ultimately trying to survive while weeding out the odd man out. Spoilers for both shows are deadly and should be avoided at all costs.

Similar premise teenagers lost in space. While Kanata no Astra is more light hearted/positive and has a balance between humor and drama, Mugen no Ryvius is generally more serious and tackles social and political issues (some call it "Lord of the Flies in space"). Kanata no Astra has a strong focus on friendship while Mugen no Ryvius creates a realistic battles of power between different factions all the while everyone tries to survive.

Both share the same kind of "survival" feeling and their plot revolve around some kind of incident that happend to the human species that made them be in this kind of survival setting.

a lot of people don't know Kanata no Astra is a kind of homage to 11-nin Iru!
many of the same characters, similar premise about kids training to fly into space end up on a ship and have to learn to cooperate to achieve their goal. Astra is a full series from a longer manga (11-nin Iru! is a one shot iirc) so can go into more depth, but if you like Astra, this movie is worth checking out. vice versa of course

The shows take place in the future and the histories of the worlds the main characters live in are filled with mysteries. The stories focus on teenagers/kids who find themselves in a dangerous situation and have to work together to get out of it alive. The main protagonists of both series are determined not to leave anyone of their team/family behind.

The 2 may have different setting , where one was set in some deserted Island , while the other one was set in the future , but the goal were still the same which the group have to work together in order to survive.

sci-fi and comedy go hand in hand in both of these shows, though I most say that RobiHachi is much more on the comedy side than Kanata no Astra, and Kanata no Astra has a better storyline I guess ( both are comedies in the end and shouldn't be too fixed on the story anyways in my opinion), so in conclusion if you enjoyed the comedy aspect of Kanata no Astra you will definitely enjoy this one

Group of teens who experience character growth together and uncover truths of their worlds, changing their lives as they have known it growing up. Very similar feeling

group of individuals stuck together who have to learn about each other and work through different hardships together, another anime about building relationships with each episode portraying a new test/obstacle
i greatly enjoyed both, although nakanohito genome may be considered as less serious

both anime they adventure in space. both mc is scholl and them both try survivng in space.

Both titles delve into the themes of exploring interpersonal bonds in unique environments against their will of the protagonist, pairing them up with complete strangers. While having different settings, both plots incorporate a sci-fi mystery aspect that is well crafted that unfolds and thickens the plot greatly throughout the story. They both start off on the lighter side, exploring characters and their bonds and finish with deep and interesting plots worthy of making them sci-fi tags.

both focus on space exploration (although Kanata no Astra has elements of science fiction and Uchuu Kyoudai is more realistic)

Gankutsuou and Astra Lost in Space are similar. They each follow a group of teenagers set in the future, in which a series of mysteries will unfold. Each has their fair share of dramatic moments and plot twists. Characters in each of these anime have diffucult pasts, a common factor being a poor relationship with their parents.

The second parts of the shows are similar, in a sense that you understand a lot more the history of the world they live in.

Both are space animes without zapping each other like Star War. Both includes some decree of romance, drama and comedy.

The initial premise is almost identical: A group of privileged kids are no longer wanted and get discarded on a foreign planet. From there on, they have explore the planets, figure out how to survive, solve the mystery of why people want them dead - and somehow try and get back home again. Along the way, they'll struggle to survive, encounter betrayal and love - and fight against the lies and deceit that got them exiled in the first place. And as a bonus, both stories are complete with their 11/12 episodes!
In short, if you liked one of the series, you'll surely enjoy the other one too, though the premise is executed a bit differently in the end.

"kanata no astra" and "one piece" are two gems in adventure genre. in fact,both the series have a very wonderful settings which is really easy to get into. besides, if you like animez with lots of wonderfully fleshed-out character,particularly a strong and dependable MC who jokes around all the time but gets serious when needed, i promise you won't regret watching these.