Galaxy Warp

The "Galaxy Warp" is a large Gem structure that is first mentioned in "Mirror Gem" and makes its first appearance in "Space Race".

About
The Galaxy Warp is the former central hub on Earth for interstellar transport through the galaxy used by Gems, replacing the Colony type ships. The system consists of numerous warp pads of varying sizes that have been inactive for thousands of years. The Galaxy Warp is located atop a large plateau, surrounded by an ocean or large lake and numerous smaller islands.

Six massive inorganic rock formations surround the perimeter of the summit, which houses sixteen individual warp pads arranged in a crop circle-like pattern. The central pad directly links Earth with the Gem Homeworld.

As of "Friend Ship", one of this rock formations has collapsed from damage due to Peridot's attacks. In addition, another warp pad was completely destroyed in an attempt to capture Peridot.

"Mirror Gem"
The Galaxy Warp is mentioned in "Mirror Gem". Lapis' mirror was retrieved from there.

"Space Race"
The Galaxy Warp makes it first appearance in the episode as the Crystal Gems are checking up on it, using Steven's Crying Breakfast Friends stickers to mark its inactive warp pads.

"Warp Tour"
The Crystal Gems follows Peridot's Robonoids back to the Galaxy Warp where they proceed to repair the Homeworld warp, allowing Peridot to warp there. She then hastily retreats upon discovering one of the stickers, believing the site to have been "compromised". Garnet then proceeds to smash the Homeworld warp with her gauntlets.

"Winter Forecast"
While not featured in the actual episode, Steven discovers through his future vision that the Gems launched the Shooting Star directly to the Galaxy Warp with the objective of destroying it once and for all.

"Friend Ship"
The Galaxy Warp appears to be untouched. Peridot was seen attempting to repair the Homeworld Warp before fighting the Crystal Gems and later using the only active Warp Pad to escape.

Trivia

 * In "Winter Forecast", Pearl mentions that Homeworld Gems are able to reach Earth without using the Galaxy Warp, such as by traveling in a Gem Warship.
 * Ancient Gems also travelled to Earth by spaceship, specifically in Ancient Gem Colony Ships.
 * Pearl states in the episode "Mirror Gem" that the Crystal Gems obtained the mirror containing Lapis Lazuli at the Galaxy Warp.
 * Rebecca Sugar first hinted that the Crystal Gems were intergalactic at the first standalone Steven Universe panel at San Diego Comic Con.
 * It has a crop circle symbol pattern that appears occasionally in the series.
 * This pattern also can be seen aside the left stairs in the entrance of the Ancient Sky Arena.
 * The Galaxy Warp's design resembles circular Gallifreyan, the language of the Time Lords in Doctor Who, who also used to travel across the universe.
 * This is the first place Peridot was seen.
 * She is seen there again in "Friend Ship".
 * In addition, this is the first episode that features the Galaxy Warp in a daytime setting.
 * In an alternate timeline, seen using Garnet's future vision, Steven interrupts the warping process and the Shooting Star detonates, destroying the Crystal Temple.
 * All warp pads at the Galaxy Warp are heavily damaged (and thus rendered inactive), especially the Homeworld warp as of "Friend Ship".
 * The domestic warp pad is the only functioning warp pad at the site.