Centauri Prime is a temperate world with a oxygen/nitrogen atmosphere, vast oceans and only a handful of large landmasses. Like other worlds such as Shir-shraba and Earth, Centauri Prime was home to two distinct sentient races, the Centauri and the Xon. Both evolved around the same time but on different continents, remaining separate until one or both developed the technology to cross the oceans. When they finally did meet, they began competing with one another for land and resources, culminating in a vicious conflict that became known as the War of 20 Million Deaths that only ended when the Xon were finally wiped out by the Centauri.
Centauri Prime is similar to Earth, with much of the surface covered in oceans, and having a Nitrogen-Oxygen rich atmosphere. The weather seems comparable to Earth as well, as there is at least seasonal changes, including snow over the capital city in winter.
Two vast oceans separate two of the primary clusters of continents, resulting in the development of the Centauri race on one and the Xon on the other. After centuries of brutal warfare and genocide, the Xon become extinct.
- Capital City: The capital was a large metropolis located in one of the more temperate regions of Centauri Prime, not too far from a coast. The Capital was the location of the Royal Palace along with the Royal Court and the Centaurum. Near the end of 2262, much of the capital was devastated by a joint Narn-Drazi fleet that fired on the planet, after the Drakh managed to send away or deactivate the planet's defenses. By Emperor Mollari II's command, reconstruction got underway soon after under the supervision of Castig Lione, the chancellor of Development. The city was destroyed again in 2277, again thanks to the machinations of the Drakh. It would again be rebuilt later under Emperor Cotto.
- Celini: Celini was a barely inhabited island in the southern hemisphere on Centauri Prime. In 2261, during the latter part of the Second Shadow War, after the destruction of their capital on Z'ha'dum, the Shadows convinced Emperor Cartagia to allow them to establish a base there. When Cartagia was assassinated, Prime Minister Londo Mollari detonated three fusion bombs secretly planted throughout the island, effectively destroying it, and wiping out the Shadows' presence there. The Drakh would remember this act when they enacted their revenge against the Centauri in the following years.
- Centallus: Birth city of Cartagia.
- Scoria Plains: An area of Centauri Prime located near the sea, on the far side of the River Tuwain from the Royal Palace. Site of the historic "Battle of the Scoria Plains" Circa 1062.
- Tuwain: A famous river located partway between the Royal Palace and the Scoria Plains, this is where Emperor Morell met Malia who would become the first Prophetess Supreme Circa 1062.
- Twindle: Birth city of Vir Cotto.
- Xonos: One of the few major continents on Centauri Prime that was the home and former stronghold of the Xon. In May 2269, an ISA intelligence probe detected a munitions facility on the sparsely populated continent and sent a contingent of agents to investigate.
During the second Shadow war, Shadow vessels took refuge on the Island of Celini at the blessing of Emperor Cartagia. After removing Cartagia from the throne, Londo Mollari completely destroyed the island, obliterating the grounded Shadow fleet, in an attempt to remove all Shadow influences from the planet so the Vorlon would spare it.
Fall of Centauri PrimeEditA joint fleet of Narn and Drazi warships laid waste upon Centauri Prime in response to alleged Centauri attacks on Alliance shipping lines. Unknown to them, the Centauri were not behind the attacks. They had been framed by the Drakh, former servants of the Shadows who wished to exact revenge upon the Centauri. 
- Centauri Prime has at least one moon. 
- Centauri Prime is 75 light-years from the Babylon 5 station.
- ↑ Into the Fire
- ↑ JMS post on rec.arts.sf.tv.babylon5.moderated - 3/6/1994 4:47:00 PM
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Dining on Babylon 5
- ↑ The Parliament of Dreams
- ↑ JMS post on GENIE - 2/28/1994 7:08:00 AM
- ↑ The Long Night of Centauri Prime - (p.79)
- ↑ Out of the Darkness
- ↑ War Without End, Part II
- ↑ In the Beginning
- ↑ Sleeping in Light
- ↑ The Long Night of Centauri Prime - (p.199)
- ↑ The Long Night of Centauri Prime
- ↑ 13.0 13.1 "Babylon 5 Personnel Files 4.0" (Season 4 DVD, Disc 6)
- ↑ Armies of Light and Dark - (p.178 - p.185)
- ↑ 15.0 15.1 Shadow of His Thoughts
- ↑ Knives
- ↑ TKO
- ↑ The Fall of Centauri Prime
- ↑ The Coming of Shadows
- ↑ The War Prayer