Astra (ship)

The Astra is the spaceship that the students of Caird High School use to pilot in order to return home from deep space. The name was given by Kanata Hoshijima as part of a plaque placed on the ship, which said: "Ad Astra, Per Aspera" (Latin for "To the stars, through difficulties").

The Astra is an older ship, but does have FTL capability.

According to Paulina Levinskaya, the spaceship's actual name is Ark XII, which was used for exploration in deep space to find a suitable planet to replace Earth before an asteroid hit it.