Aldebaran, designated Alpha Tauri (α Tauri, abbreviated Alpha Tauα Tau), is an orange giant star located about 65 light-years from Sol in the zodiac constellation of Taurus. It is the brightest star in its constellation and usually the fourteenth-brightest star in the night sky, though it varies slowly in brightness between magnitude 0.75 and 0.95. Aldebaran hosts a gas giant planet several times the size of Jupiter known as α Tau B.

The star was first visited in 2097 by the starship Orinoco, one of the starships belonging to the MSEP. The crew settled into orbit of the star's only known gas giant and made close scans of its rings and clouds. To their great surprise, they discovered massive octahedron shaped masses within the planet's own thin ring system, similar in form to the pyramids on Betelgeuse. However, these artifacts belonged instead to the First Civilization.

The gas giant orbiting Aldebaran.

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