A planet where Dr. Farallon's experimental particle fountain mining station was being tested.
Tyrus VIIA is a world chosen as the test site for the particle fountain, a new mining technology designed by Dr. Farallon. An orbital station supports the work, and its malfunctions are repaired by her robotic exocomps.
In The Quality of Life, the Enterprise arrives at Tyrus VIIA to evaluate the project. When the station suffers a radiation surge with Picard and La Forge aboard, Data's refusal to sacrifice the exocomps leads to a debate over whether they are living beings.