Space

Space is a layer appearing at the top of the world: ~950 feet and above for large worlds, ~700 for medium worlds, and ~425 for small worlds. Gravity is decreased in Space, which means the player can jump higher, and will fall slower, similar to the Featherfall Potion effect. The sky is dark and stars are visible, even when the Sun is still up. It has its own unique theme music.

There are no particular naturally-occurring blocks or objects in Space, other than the possibility of Floating Island or Living Tree parts extending into it.

As with all high-altitude locations, Harpies will spawn, and in Hardmode, Wyverns. Fallen Stars spawn in this environment and can appear inside structures made at that altitude. Martian Probes have a more likely chance of spawning in space.

Space seems to contain air, as the breath meter does not appear when entering it.

Monsters such as Slimes and Zombies can also appear in Space, given a surface to spawn on.

Reaching Space

 * Build a pillar of blocks or Rope.
 * Gravitation Potion.
 * Wings, Rocket Boots, or other jump-boosting accessories, especially when used from a Floating Island or with the Ice Rod for intermediate landing in midair.
 * You can also easily view space in ghost form with a deceased hardcore character.

Achievement
Into Orbit is the achievement you earn for reaching the top of Space ( only).