Any anime set in space belongs to this subgenre, often associated with mecha and sci-fi.

Aldnoah.Zero

25 min, 24 episodes, 1 season \ space - sci-fi - mecha - military - action

Armored Trooper Votoms

22 min, 73 episodes, 4 seasons \ mecha - action - space - military - drama - sci-fi

Astra Lost in Space

24 min, 12 episodes, 1 season \ space - sci-fi - adventure - shounen

Black Lagoon

25 min, 24 episodes, 1 season \ space - seinen - action

Blue Gender

24 min, 26 episodes, 1 season \ post-apocalyptic - adventure - romance - mecha - military - sci-fi - horror - space - drama

Bodacious Space Pirates

25 min, 26 episodes, 1 season \ space - sci-fi

Crest of the Stars

25 min, 36 episodes, 3 seasons \ space - sci-fi - military - action - romance

Cowboy Bepop

24 min, 26 episodes, 1 season \ cyberpunk - action - adventure - comedy - drama - sci-fi - space

Edens Zero

25 min, 25 episodes, 1 season \ space - comedy - fantasy - shounen - adventure - sci-fi - action

elDLIVE

25 min, 12 episodes, 1 season \ space - action - sci-fi - shounen - police

Freedom

25 min, 7 episodes, 1 season \ space - action - adventure - sci-fi

GunBuster

30 min, 12 episodes, 2 seasons \ mecha - action - comedy - drama - military - sci-fi - space - shounen

Heroic Age

30 min, 26 episodes, 1 season \ space - action - military - sci-fi - mecha

Infinite Ryvius

25 min, 26 episodes, 1 season \ space - military - sci-fi - mecha - drama - psychological

Knights of Sidonia

24 min, 24 episodes, 2 seasons \ post-apocalyptic - action - mecha - sci-fi - seinen - space

Legend of Black Heaven

25 min, 13 episodes, 1 season \ space - adventure - sci-fi - music - comedy - slice of life

Legend of the Galactic Heroes

24 min, 110 episodes, 4 seasons \ space - military - drama - sci-fi

Macross Frontier

25 min, 25 episodes, 1 season \ mecha - action - space - romance - military - music - sci-fi

Majestic Prince

24 min, 24 episodes, 1 season \ space - action - school - seinen - sci-fi

Martian Successor Nadesico

23 min, 26 episodes, 1 season \ mecha - action - comedy - military - parody - romance - sci-fi - shounen - space

Mobile Suit Gundam Wing

25 min, 49 episodes, 1 season \ mecha - action - military - space - drama

Outlaw Star

30 min, 26 episodes, 1 season \ space - action - sci-fi - adventure - comedy

Planetes

25 min, 26 episodes, 1 season \ seinen - romance - drama - sci-fi - space

RobiHachi

25 min, 12 episodes, 1 season \ space - comedy - sci-fi - adventure

Space Brothers

24 min, 99 episodes, 2 seasons \ seinen - comedy - space - slice of life - sci-fi

Space Dandy

25 min, 26 episodes, 1  season \ space - sci-fi - comedy

Space Patrol Luluco

24 min, 13 episodes, 1 season \ space - adventure - comedy - action

Star Blazers: Space Battleship Yamato 2199

24 min, 52 episodes, 2 seasons \ space - sci-fi - drama - military - action

Super Dimensional Fortress Macross

23 min, 36 episodes, 1 season \ mecha - action - music - military - romance - sci-fi - space

Terra E... 

25 min, 24 episodes, 1 season \ space - sci-fi - drama - shounen - military - action 

Terra Formars

25 min, 26 episodes, 2 seasons \ splatter - action - sci-fi - space - horror - drama - seinen

The Irresponsible Captain Tylor

24 min, 26 episodes, 1 season \ space - parody - military - comedy - sci-fi

The Girl Who Leapt Through Space

25 min, 26 episodes, 1 season \ space - adventure - sci-fi - comedy

Toward the Terra

1h 50 min, 1 episode, 1 season \ space - sci-fi - drama - action - shounen

Turn Into Gundam

23 min, 50 episodes, 1 season \ mecha - action - military - sci-fi - adventure - space - drama - romance

Valvrave the Liberator

25 min, 24 episodes, 2 seasons \ space - action - mecha - military

Vandread

25 min, 26 episodes, 2 seasons \ space - shounen - mecha - sci-fi - ecchi - action

Voices of a Distant Star

25 min, 1 episode, 1 season \ space - sci-fi - drama - mecha - romance

Welcome to THE SPACE SHOW

2h 15 min, 1 episode, 1 season \ space - fantasy - adventure