A scientist on the colony world Penthara IV who works with the Enterprise in 2368 to save the planet from a deep freeze caused by an asteroid impact.
Doctor Hal Moseley is a scientist living on Penthara IV, a Federation colony. He appears in the episode A Matter of Time, played by Stefan Gierasch.
An asteroid has struck an uninhabited part of the planet and thrown up a dust cloud that is cooling the climate dangerously. Moseley works with Geordi La Forge and Data on a plan to drill into underground pockets of carbon dioxide and warm the world by releasing the gas. The drilling sets off earthquakes and volcanic eruptions that make matters far worse.
Moseley stays at his post as conditions decline and supports a last, very risky attempt to clear the atmosphere using the ship's phasers and deflector. Picard has to decide whether to try it without help from the supposed historian Berlinghoff Rasmussen. The attempt works and the colony is saved.