Quiescia was a planet with a breathable atmosphere and a surface composed of nothing but jagged blue rocks.
The Third Doctor and Sarah Jane Smith buried Laika on Quiescia. The Eighth Doctor later buried the Relic on Quiescia and destroyed it with a thermosystron bomb. (PROSE: Alien Bodies)
Bernice Summerfield searched for the Doctor's remains on the planet, but found nothing. (PROSE: The Shape of the Hole)