Nine Realms

"For the first time since the Bifrost was destroyed, the Nine Realms are at peace. They're well reminded of our strength, and you have earned their respect and my gratitude."

- Odin to Thor

The Nine Realms are a group of distant planets that are interconnected by the cosmic nimbus Yggdrasil and are home to various different races and cultures. With the destruction of Asgard, the planets are technically now the Eight Realms.

History
The Nine Realms are 6 planets, a planetary body, a star and a neutron star, all in separate spiral galaxies, they are systematically connected by the invisible cosmic nimbus Yggdrasil. The dimensional anomaly of yggdrasil makes travel between the realms instantaneous, so the inhabitants of the realms are mostly associated with each other rather than the rest of the universe.

First Dark Elf Conflict
The Dark Elves of Svartalfheim ruled absolute in the previous universe before the big bang and survived into the new one, when life and civilisations started to grow around them, the Dark Elves failed to adapt in the new universe and sought a way to transform it to one of dark matter to which they preferred, Malekith there king planed to do this by using the approaching Convergence and transforming the Reality Stone into a liquid and spreading it throughout the nine realms transforming them. In 2988 B.C., the Convergence finally began, and the Dark Elves were prepared to begin their plan. However, an Asgardian army led by Bor confronted the Dark Elves on their homeworld, Svartalfheim, having learned of their intentions. A major battle ensued, exhausting many of the Dark Elves' soldiers and the Asgardian Einherjar. Seeing that his forces were being expended at a dangerous rate, Malekith chose to use the Aether quickly, only for the Asgardians to warp it from the battlefield using the Bifrost Bridge ending the threat.

Subjugation of the Nine Realms
Odin, Bor's son and successor began an invasion of the nine realms with his daughter Hela, they and the Einherjar devastated and pillaged the realms put them under Odin's rule, making them dependant on his protection from outside attack. Odin though realised that peace is the true way to unite the Realms and gave anatomy to the realms with peace treaty's and banished Hela after she tried to stop him.

Preventing Ragnarök
For millennia a prophesy foretold of an event that would bring about the destruction of their homeworld. Known as Ragnarök, said event was destined to take place when the fire demon Surtur, empowered by the Eternal Flame, unleashed his rage upon Asgard and consumed it in fire. In an attempt to prevent the fateful prophecy from being fulfilled, King Odin Borson confined Surtur to Muspelheim and locked the Eternal Flame in a vault beneath his palace.

War with the Frost Giants
In 965 A.D., King Laufey of Jotunheim invaded Midgard intending to enslave the humans and place the planet into a new Ice Age to replace their own dying world. Odin led his Asgardian army against Laufey and his horde of Frost Giants in the Asgard-Jotunheim War. Asgard won and In exchange for his life, Laufey agreed to a peace treaty between Asgard and Jotunheim which would last for over thousand years. After the battle, Odin's forces took the Casket of Ancient Winters from one of Laufey's temples to ensure that the Frost Giants could never attack any other worlds ever again.

The Convergence
Every five-thousand years, an event called the Convergence would take place in Yggdrasil where the spatial boundaries between the Nine Realms gradually decrease until becoming almost non-existent. This would result in the formation of portals between the worlds.

Asgard

 * Population: Asgardians
 * Rulers:
 * Buri †
 * Bor †
 * Odin †
 * Loki (disguised as Odin)
 * Hela †
 * Thor (King of the Asgardians)
 * Regions:
 * Nornheim
 * Valhalla
 * Description: Asgard is a planetary body, home to the Asgardians, a powerful race recognized by the galaxy as honorable and brave peacekeepers. It was destroyed by Surtur in order to defeat Hela and enact Ragnarök.

Midgard

 * Population: Humans and Inhumans
 * Rulers:
 * Several leaders of different Nations
 * Description: Earth is the third planet from the Sun in its solar system. It is home to the Humans, Inhumans, a number of Asgardian immigrants, and is one of the Nine Realms aligned by the cosmic nimbus, Yggdrasil. The various races of the Nine Realms refer to Earth as "Midgard," while those living beyond the realms call it "Terra." Earth orbits around a single sun and has only one permanent natural satellite, named Luna, though usually simply called the Moon.

Jotunheim

 * Population: Jotuns
 * Rulers:
 * Laufey †
 * Description: Jotunheim is a frozen planet and is home to the Frost Giants. The planet is seen to be deteriorating from the lack of ice magic that comes from the Casket of Ancient Winters.

Svartalfheim

 * Population: Harudheeniksel
 * Rulers:
 * Malekith †
 * Description: Svartalfheim is a planet forever in the event horizon of a black hole and is home to the Dark Elves. The Asgardians and other inhabitants of the Nine Realms refer to it as the "Dark World," while the Dark Elves themselves call it "Harudheen". Located in a star system that is almost completely corroded with dark matter, both Svartalfheim and the Dark Elves inhabiting it have developed under a more diverse table of elements. The only source of visible light is the black hole.

Vanaheim

 * Population: Vanir
 * Rulers:
 * Unknown
 * Description: Vanaheim is densely wooded planet, home to the Vanir.

Nidavellir

 * Population: Dwarves
 * Rulers:
 * Eitri
 * Description: Nidavellir is Dyson Sphere around a Neutron Star, and is home to the Dwarves. This realm acts as the greatest forge in the universe.

Niflheim

 * Population: Unknown
 * Rulers:
 * Hela †
 * Regions:
 * Hel
 * Description: Niflheim is one of the Nine Realms.

Muspelheim

 * Population: Fire Demons and Fire Dragons.
 * Rulers:
 * Surtur †
 * Description: Muspelheim is an organic Dyson Sphere and is home to the Fire Demons and Fire Dragons, and is a realm of fire.

Alfheim

 * Population: Light Elves
 * Rulers:
 * Unknown
 * Description: Alfheim is one of the Nine Realms and is home to the Light Elves.

Triva

 * Earth, where humanity resides, is one of the Nine Realms, but its inhabitants are considered to be too underdeveloped by the other races to associate with.


 * Heimdall of Asgard watches over the Nine Realms and other regions of space. He mentions to Thor that from his post at his observatory he can see nine realms and ten trillion souls. This is the approximate number of inhabitants throughout the Nine Realms or in the region of space the Asgardians preside over.