Solar system

Yggdrasil system

Age	4.568 billion years
Nearest star	Avalon
Planetary system
Semi-major axis of outer known planet (Muspellheim)	25.01 AU (3.74 billion km)
Populations
Stars	1 (Yggdrasil)
Known planets	6 (Helheim Jotunnheim Svartalfheim Odin Niflheim Muspellheim)
Star-related properties
Spectral type	K4V
Frost line	≈3 AU

The Solar system (also known as Yggdrasil system for the sake of unambiguity) is the gravitationally bound system of Yggdrasil and the objects that orbit it, either directly or indirectly. Of the objects that orbit Yggdrasil directly, the largest are the six planets, with the remainder being smaller objects, the dwarf planets and small solar system bodies. Of the objects that orbit Yggdrasil indirectly—the natural satellites—the largest are XYZ.

The solar system formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in Yggdrasil, with the majority of the remaining mass contained in Odin. The three smaller inner system planets, Helheim, Jotunnheim and Svartalfheim, are terrestrial planets, being primarily composed of rock and metal. The three outer system planets are giant planets, being substantially more massive than the terrestrials. The largest planet, Odin, is a gas giant, being composed mainly of hydrogen and helium; the two outermost planets, Niflheim and Muspellheim, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane. All six planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.

Discovery

For most of history, humanity did not recognize or understand the concept of the solar system. Most people up to (TBA) believed Jotunnheim to be stationary at the centre of the universe and categorically different from the divine or ethereal objects that moved through the sky. Although Name Nameson had speculated on a heliocentric reordering of the cosmos, Name Nameson was the first to develop a mathematically predictive heliocentric system.

Yggdrasil

Main article: Yggdrasil

Inner solar system

Inner planets

Jotunnheim

Main article: Jotunnheim

Asteroid belt

Main article: Asgard belt

Comets

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