At the end of Star Wars: The Force Awakens, Luke Skywalker makes his first on-screen appearance since 1983's Return of the Jedi.
The scene begins with Rey's arrival on the green and lush planet to discover Luke at the top of a tall mountain. It ends with Rey holding out Luke's lightsaber to him.
However, the most important question raised by that scene was this: where exactly is Luke? What planet is he on?
Now we have an answer. The name of the planet appears in the script released to the Writers Guild Award for nominations. It also appears in the junior novelization of the film.
So if you can see the WGA script, yes, the name of the planet from the end of the movie is there.
— Pablo Hidalgo (@pablohidalgo) January 1, 2016
Hidalgo is a story group member for Lucasfilm.
The planet's name is Ahch-To. However, the name isn't as important as the ruins seen briefly in that final scene from The Force Awakens. The novelization of the movie unveils that this planet holds the first Jedi Temple. This is the first mention of this particular planet in the Star Wars universe and it is obviously significant: there is probably a good reason for Luke choosing to live there. However, fans wanting to know how it plays into the story will probably have to wait for more details arriving with the next film, Episode VIII.
Here's what the Star Wars Wiki says about the Temple:
"The first Jedi Temple was an ancient building established and maintained by the Jedi Order on Ahch-To. It was the first of many temples built throughout the galaxy, and one of the few that were not destroyed by the Galactic Empire. Luke Skywalker came to live there as a hermit after his apprentice and nephew Ben turned to the dark side of the Force."
In reality, the setting for Ahch-To is actually Skellig Michael, which is an island just off the coast of Ireland. The ruins there are an ancient monastery where Celtic monks once lived solitary lives, separated from the rest of the world. Strangely enough, this coincides with Luke's story, who moved there to live the life of a hermit.