The Hobus star is located in the Beta Quadrant's Devron sector, 500 light-years from Romulus, in the outermost reaches of the Romulan Star Empire. It is one of the oldest stars in the galaxy. (TNG comic: "Countdown")

In 2387, the Hobus star exploded in a supernova which threatened the galaxy. The first indications of the disaster were observed on Stardate 64333.4 by the crew of the Romulan Mining Guild ship Narada, who were mining the first planet in the Hobus system for the rare mineral decalithium. Wild fluctuations in Hobus’ radiation output forced the Narada to abandon a mining operation and evacuate the area at warp. The star erupted, destroying the planet. Ambassador Spock warned the Romulan senate that the imminent supernova would be “unlike any the galaxy has ever seen” and that the star had converted the planet’s mass into energy, increasing its own power. (Countdown) 27 hours after stardate 64444.5, the Hobus star exploded, the effects propagating through subspace at multiwarp speeds, destroying the planets Romulus and Remus. On Stardate 64471.6 (STO website: The Path to 2409), Ambassador Spock, using a prototype ship (the Jellyfish) equipped with red matter, created a black hole, absorbing the exploding star. (TOS movie, novelization & comic adaptation: Star Trek; TNG comic: "Countdown")

The supernova left behind the parsecs-deep, amber-hued Hobus Nebula. At the center of the nebula, the Hobus stellar remnant, known as the Hobus Cinder, is still active and can be seen pulsing through the nebula gasses (STO novel: The Needs of the Many)

In 2388, Admiral Kathryn Janeway flew the first survey mission of the Hobus Nebula aboard a variant of the Delta Flyer with a crew of volunteers. It was discovered that the supernovas neutrino output was somehow being shunted into subspace, and that the Hobus Cinder continues to output intense streams of X-rays, gamma rays, delta rays, epsilon radiation, Berthold rays and tetryon particles. (STO novel: The Needs of the Many)

As mandated by the Federation Science Council, Starfleet conducts annual surveys of the Hobus Nebula. In the early 2400s, Admiral Janeway commanded one such mission aboard the Excalibur-class USS Tucker, where she was interviewed by Jake Sisko. In the interview, Admiral Janeway classified Hobus as a Type 1a supernova with unexplained FTL properties. In other words, the wave was propagating outward at multi-warp speeds, something no natural supernova should be able to do. (STO novel: The Needs of the Many)

In 2409, a Starfleet ship performed a more thorough scan of the system and found a Reman base on Hobus 1. Inside the base they found evidence that the destruction of the Hobus star was caused by protomatter explosives injected into the core of the star. It seems that the shock wave fed on energy from the surrounding planets, allowing it to travel as fast as it did. This explained the strange behavior of the supernova, but it still remained a mystery who had done this. (STO mission: "Ground Zero")

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