What Is Skyring in the 100?

Skyring is actually a prison world for the Disciples where they would send law-breakers for five years before coming back for them if they survived. A few months after the capture of Octavia and Diyoza, one Disciple prisoner, Dev, arrived at that point and trained Hope.

What planet did the 100 go to?

In the sixth season, after 125 years in cryosleep, Clarke, Bellamy, and the others wake up to find out that they are no longer orbiting Earth and have been brought to a new habitable world, Alpha, also known as Sanctum.

Is Bardo a Earth?

Bardo is specifically identified as being a planet unlike Sanctum which was originally believed to be a planet but turned out to be an habitable moon instead.