Asgard is the name of a fictional realm and its capital city within the Marvel Comics universe. Based on the realm of the same name from Norse mythology, Asgard is home to the Asgardians and other beings adapted from Norse mythology. Asgard first appeared in Journey into Mystery #83 (October 1962) by Stan Lee, Larry Lieber and Jack Kirby, and features prominently in stories that follow the Marvel Comics superhero, Thor.
According to Asgardian legend, in the beginning there was nothing, but in time two worlds came into being on opposite sides of the void. The one to the north was named Niflheim, a world of clouds and shadows in whose center surged the fountain Hvergelmir, from which flowed twelve rivers of ice. The one to the south was named Muspelheim, which teemed with rivers of fire. Eventually the warm air from the south carved out the frost giant Ymir from the ice in the north. Ymir became the father of all the giants, and his cow Auðumbla licked out of the ice the first Asgardian, Buri. Buri had a son named Borr, who married the giantess Bestla. Borr and Bestla had three sons named Odin, Vili, and Ve, who were known as the Æsir. Odin and his brothers grew to hate the giants and slew Ymir, and his blood formed a great sea. Odin and his brothers then raised Ymir's body from the sea and created Midgard between Niflheim and Muspelheim. With Ymir's bones they created mountains, and with his hair they created trees. They then raised Ymir's skull upon four pillars to create the heavens. Within the skull contained sparks from Muspelheim, which became the sun, moon, and stars. When Midgard was complete, Odin and his brothers created a home for themselves above it called Asgard. Between the two worlds they stretched a rainbow bridge and called it Bifröst.
In Norse religion, Asgard (Old Norse: ''Ásgarðr''; "Enclosure of the Æsir") is one of the Nine Worlds and home to the Æsir tribe of gods. It is surrounded by an incomplete wall attributed to a Hrimthurs riding the stallion Svaðilfari, according to Gylfaginning. Odin and his wife, Frigg, are the rulers of Asgard.
One of Asgard's well known locations is Valhöll (Valhalla), in which Odin rules.
The primary sources regarding Asgard come from the Prose Edda, written in the 13th century by Icelandic Snorri Sturluson, and the Poetic Edda, compiled in the 13th century from a basis of much older Skaldic poetry.
Völuspá, the first poem of the work, mentions many of the features and characters of Asgard portrayed by Snorri, such as Yggdrasil and Iðavöllr.
The Prose Edda presents two views regarding Asgard.
In the Prologue Snorri offers an euhemerized and Christian-influenced interpretation of the myths and tales of his forefathers. As-gard, he conjectures, is the home of the Æsir (singular Ás) in As-ia, making a folk etymological connection between the three "As-"; that is, the Æsir were "men of Asia", not gods, who moved from Asia to the north and some of which intermarried with the peoples already there. Snorri's interpretation of the 13th century foreshadows 20th-century views of Indo-European migration from the east.
Asgard is the second largest multi-ring structure (impact crater) on Jupiter's moon Callisto, measuring 1600 km in diameter. It is named after Asgard, the realm of the gods in Norse mythology. The central part of Asgard is dominated by the domed Doh impact crater.
A smaller multi-ring structure is superposed on the northern part of Asgard. It is called Utgard (also from Norse mythology) and measures ~600 km in diameter.Utgard is the fourth largest multi-ring feature on Callisto. A substantial part of the central region of Utgard is covered with deposits from the relatively young Burr crater.
The Asgard are a highly advanced, fictional extraterrestrial race in the science fiction series Stargate SG-1 and Stargate Atlantis. They are first mentioned in the episode "Thor's Hammer", and first seen in "Thor's Chariot". In the series, the Asgard gave rise to Norse mythology on Earth, as well as accounts of the Roswell "Greys". Due to their technological Prowess, the Asgard are critical allies in Earth's fight against the Goa'uld, and later the Ori. The Asgard characters on the show are realized through a combination of puppets and computer-generated imagery.
The episode "The Fifth Race" establishes that the Asgard inhabit the galaxy of Ida, and that they were once part of an alliance of four great races with the Ancients, Nox, and Furlings. In ancient times, the Asgard visited Earth, posing as the gods of Norse mythology. Norse legends tell of how they protected the humans against the "Ettins" (Goa'uld). The Asgard protect a number of planets in the Milky Way from Goa'uld attack under the Protected Planets Treaty. In the time of Stargate SG-1, the Asgard are a dying race. Having lost the capacity for sexual reproduction, they perpetuate themselves by transferring their minds into successive cloned bodies. Repeated generations of cloning has led to an irreversible degeneration of the Asgard genome. A 30,000-year-old Asgard ancestor is depicted in "Revelations", showing a more human-like appearance.