Olveron Cluster

The Olveron Cluster was a star cluster which contained a million stars and a hundred million inhabited planets. The Twelfth Doctor shown the cluster to Coal Hill student Courtney Wood, after ejecting the Skovox Blitzer out of the TARDIS. Unfortanutely the trip in the TARDIS made Courtney too ill to admire the sight, she proceeded to run inside and vomit. (TV: The Caretaker)