Esera

Esera, casting a vast shadow on Teralla

Image of Esera from low Teralla orbit

### Atmospheric Composition

He: 0.0100% N: 0.2000% O: 1.1000% CH₄: 0.0500% NH₄: 0.0000% H2O: 1.0000% Ne: 1.2000% N2: 68.3000% CO: 0.0010% NO: 0.0020% O2: 25.1000% H2S: 0.0070% Ar: 1.2000% CO2: 0.5000% N2O: 0.0001% NO2: 0.0001% O3: 0.0005% SO2: 0.0003% SO3: 0.0001% Kr: 0.8500% Xe: 0.4789%

## Miscellaneous

### Interesting Characteristics

Binary orbit with Teralla, first planet colonized by the Terallans

Esera, formerly known as The Moon, is the largest and only moon of Teralla. In fact, it is the largest moon relative to it's parent in the entire solar system!

## Physical Characteristics

Esera is the largest moon around Teralla. It formed 200 million years after Teralla itself, and it has a large "gash" across it's surface from being scraped by an asteroid. It's orbit is the reference plane for objects in the Teralla System. As such, it has an inclination of 0º. The gravitational interaction between itself and Teralla causes gigantic tides, often exceeding 200 meters tall, that have slowly brought Esera into a tidal lock with Teralla. The system has not existed long enough for Teralla to be tidally locked as well.

### Notable Surface Features

Esera's Lithosphere has "cracked" into several tectonic plates, similar to Teralla, and they sloooooooooooowly move across the surface of the planet, sometimes creating wonky patterns. Approximately 76% of it's surface is covered in water, leaving 24% land. Similar to it's parent planet, Esera plays host to thousands and thousands of long, curvy artificial islands. The construction of these islands has likewise largely flattened the planet, leaving the abyssal plains far less deep than they would be otherwise.

## Atmosphere

Esera's atmosphere is approximately 0.9 atmospheres, 91192.5 pascals, 13.22635392 psi, or 0.911925 bars. The atmosphere has a composition of 68.3% Nitrogen, 25.1% Oxygen, and other trace elements. Basically, it has a similar composition to it's parent planet's atmosphere.

## Climate

It's climate is very similar to it's parent planet, being at the same distance. The only real difference is that the winds aren't as strong, the atmosphere being thinner.

## Orbit and Rotation

Esera orbits around Teralla at a distance of 3 Earth Radii, and has an orbital period of just over 8 days. It is in tidal lock with Teralla, meaning that it has a rotational period equal to it's orbital period. This gives it really long days. It has a very circular orbit, allowing for a space elevator between the planets. It also has an axial tilt of 0º, being tidally locked.

## Formation

Esera formed when a very large object smacked Teralla in the face and kinda made a mess. That mess formed a giant disk of material around the planet, which slowly accreted into Esera.

## Life

Esera's life is similar but significantly less advanced than its parent planet, due to panspermia. Animals have not yet left the sea on this world, and plants have only recently covered the surface in primitive shoots. As such, the surface is not particularly interesting.

## Biomes

* Ice caps
* Ice Shelf
* Tundra
* Highlands
* Mountains
* Grasslands
* Deserts
* Badlands
* Shores
* Shallow Water
* Deep Water
* Islands