Thera was the home of Xyrillian engineer Ah'len.

In 2151, Ah'len showed Human engineer Charles Tucker III a representation of Thera in the holographic chamber aboard her starship. (ENT: "Unexpected")

The episode did not explain if Thera was the name of the Xyrillian homeworld, or just the name of the city seen in the hologram. However, the script for "Unexpected" specifies it is the name of the city.

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