Huayalo

Huayalo is the 3rd planet from the Sun. As an Earth-like planet, Huayalo has an incredible array of complex life not found on any other planet so far. Huayalo neighbors its brother planet, Ahu, and a carbon planet. Collapse of the World (世界の崩壊) takes place entirely in Huayalo, and the events in the series will determine the planet's future trajectory.

Formation
Huayalo originally began when a larger celestial object diverged into two smaller objects, Ahu and Huayalo. The large initial body was thought to possess a multitude of glacial reserves on its surface, and most likely originated the water found on Ahu and Huayalo. Ahu acts as a "moon" to Huayalo, minimizing the tilt and tides of the latter.

Prehistory
Huayalo is separated into stages and eras depending on surface conditions. As per current standards, Huayalo has 14 distinct geological time periods, each ranging from a humongous billion year span to a span of only 10 million years. The first 400 million years after the planet's birth featured a fireball Huayalo with constant meteor strikes, all together with vast lava oceans and a toxic atmosphere.

As the planet cooled for two billion years, water formed on the surface along with tectonic plates. Life soon started to exist on the planet. Bacteria were the initial forms of life, then invertebrates, insects, and simple vertebrates dominated, and finally, fishes, amphibians, reptiles, and mammals started appearing one after another. Eventually, humans become the more dominant species on the planet, and it is here where the series' history and events of Collapse of the World (世界の崩壊) start to take place.

Atmosphere
Huayalo's atmosphere has approximately 30% oxygen and 60% nitrogen, with limited amounts of carbon dioxide, argon, and other noble gases.

Surface
Huayalo only has two major continents, the southernmost Denke and the northern Kahaipe. The Huayalo Ocean, which separates the two continents, comprises the largest body of water in the middle of Huayalo; the Voltke Ocean, the second largest body of water on the planet, is located within the confines of the Kahaipe continent.

The poles themselves are slightly tilted. Ice sheets are only visible on the north-east end, and are underwater on the south-west end of Huayalo. For a planet with a lively atmosphere, Huayalo has much fewer natural disasters and volcanoes than average. The A island ,the large island at the northern end of Voltke Ocean, has two super-volcanoes, each of them inactive for millions of years.

Planetary Layers
Huayalo's core, mantle, and crust layers are similar in function to Earth's, with the former having much lighter heavy metals for the layer composition; however, the mantle layers are approximately 70% thicker than Earth's. With these factors in mind, Huayalo's density is astonishingly low for a terrestrial planet. Huayalo's thicker crust layer gives it an advantage for soil depth and agriculture.

Life
Huayalo had its own humble origins in simple life during its inception, with the development of both prokaryotes and eukaryotes. Ecologically, each organism in modern Huayalo is in fine-tune with its environment, incurring similar natural processes and relationships as seen on Earth such as photosynthesis, pollination, mutual or parasitical relationships, and others. Overall, Huayaloan life would be quite homely to Earthly inhabitants, as evidenced by the humans also thriving within the former planet.

Origin
Life on Huayalo was theorized to come from a result of panspermia or the primordal soup theory, although the latter is more convincing. It is also theorized that Huayalo's water originated solely from its parent celestial body, which had numerous frozen lakes of water. With the volcanic and meteorite activity, the water on early Huayalo's surface warmed up a significant amount, and much like early Earth, the increased atmospheric pressure allowed water to remain liquid on Huayalo's surface.

The Future
Many of Huayalo's scientists are eager to investigate more into the planet's future, including its potential atmospheric and surface changes. The "120-million year later" reference point is often used as the end milestone for future predictions of the aforementioned variables.

Atmosphere
Huayalo's atmosphere is similar to that of other Earth-like planets, with the majority of it being nitrogen. Unfortunately, with anthropogenic climate change, Huayalo's temperatures will soar higher than the current average, ending in a devastating ice age a million years later, according to scientists.



Surface
The incoming ice age will result in a greater percentage of Huayalo's surface to be covered in ice sheet layers, particularly the Voltke Ocean. As a result of this, the mean sea level will then decrease and allow for more visible landmass. If humans are still in existence, agriculturalists might then use the extra landmass as scientific grounds for potential agricultural technologies.

In 120 million years, a large super-continent similar to Earth's ancient Pangaea might form. The future super-continent will contain a "fault" in its middle, signifying the joining of the Denke and Large Huayalo Plates. The fault will contain a greater amount of volcanic activity than the planet today, as a result.

Celestial
Huayalo will not bear any significant changes to its orbital period, orbital trajectory, or axial period. Scientists even theorize that, in 2.3 billion years, Ahu and Huayalo will become so close in distance that a mass collision between the two might happen. In another billion years, although this is highly disputed, the Sun will most likely absorb the combined mass of Huayalo and Ahu into its surface. Other than those changes, there will not be any foreseeable changes in Huayalo in relation to its celestial neighbors.

Trivia

 * Huayalo most resembles the planet Earth.