Megarthia

(*This planet is unique due to it having multicellular life while being almost 13 M⨁ masses, and also not having to look far for the planet.)*

## Discovery Information

### Discoverer

GAIA EXPEDITONS (2021)Named Martin Quez (2022)

## Additional Information

### Life

Organic multicellular (marine, terrestrial)

## Megarthia's information

This world is a temperate megaterra located slightly above the galactic plane that also has multicellular life (terrestrial, marine), with a khardeshev 0.8 civilization located on it. There are 10 observed moons around this planet, though there is only one major moon around this planet, a Selena. The diameter of the planet is almost twice that of the Earth, with it being 15432.54 miles, or 1.947 R⨁, with the mass of the planet being one of the unique characteristics of it, with it being 7.6832\*10^25 kilograms, or 12.861 M⨁. Very large for a terrestrial planet, a terra, and especially for one that has multicellular life that is both marine and terrestrial. The density of the planet is 9.5782 grams per cubic centimeter, with there being a perfect 0 oblateness, a perfectly round planet. This might be due to the mass of the planet rounding the thing, or the lack of any significant moons. The effective temperature of the planet is 256.82 kelvin, with the average temperature of the megaterra being 272.85 kelvin, the conversions for that are -0.3 degrees Celsius, or 31.46 degrees Fahrenheit, a cold planet indeed. The albedo of the planet is 0.364182. The rotational period of the planet is 101.494 days with the solar day of the planet being infinite, the planet is tidally locked to its parent star, though the life of the planet has found out how to live on all sides of the planet, not just the “sunset” zone.

The axial tilt of the megaearth is 0\*22’48.02”, with the age of the planet being one of the oldest with it being 8.835 billion years old. Due to the perfect roundness of the planet, the gravity is equal across all of its surface, with the gravity being 33.282 meters per second, or 3.3926 g. The circular velocity of the megaterra is 12.63 miles per second, with the escape velocity of the planet being 17.86 miles per second. The planet has a standard elliptical orbit, with the orbital period of the planet is 101.491 days. The semimajor axis of the planet is 0.37 AU, with the pericentric distance being the same amount. The eccentricity of the planet is very little with it being just 0.010, with the inclination of the planet being 1\*01’00.79”. The ascending node of the megaterra being -158\*29’00.48”, with the argument of pericenter being 72\*05’55.40”. The mean anomaly of the planet is 291\*23’34.65”, with the longitude of pericenter being -86\*22’05.08”. The mean longitude of the megaterra being 205\*01’29.57”, with the hill sphere radius of the planet being 917,508.66 miles large. The influence sphere radius of the planet is 697,220.93 miles large, with the roche sphere radius of satellites being 13,812.07 miles large. The height of the atmosphere on this planet is 46973.55 feet high, with the tropopause height being 12539.70 feet high. The height of the homogeneous atmosphere being 4936.44 feet, with the atmospheric pressure being 11.2 ATM. The air density of the megaearth is 20.525 kilograms per cubic meter, with the air temperature of the planet is 272.85 kelvin.

The speed of sound on this planet is 890.84 feet per second, with the exosphere temperature of the planet being 1207.6 kelvin. The greenhouse effect on this planet is very low with it being just 15.99 kelvin, with the average molar mass of the planet’s atmosphere being 43.172. The average molar mass on the atmosphere however is 7.7852\*10^-7, with the mass of the atmosphere being 1.0012\*10^-5 M⨁. The planet’s atmosphere is filled with carbon, with it being 94.94% of the atmosphere. Oxygen comes in a distant second with it being 5.6% of the atmosphere. There are some mentions of this planet in pop-culture, with the most notable being that it was the name of a song in a synthwave album called “Do I miss the aughts”. The song being called “Megarthian tides” and 100,000 copies being sold as of 2029. The planet was also part of the exoplanet extremes category on the online encyclopedia, wikipedia. There is a painting that is about the sunsets on this world, with it being called “triple sunsets” and depicts a cityscape on a coast during a “sunset”, since the planet is tidally locked, there is no such thing as a “sunset” here, but instead an eternal twilight. The planet is notable for the extreme conditions that life have to be in for this planet, let alone advanced life, the planet is tidally locked, massive enough the gravity there is 3 times that of Earth’s, and has an atmosphere of carbon. The civilization on this planet is around our level of technology with them even having their own space program, which is surprising considering the gravity on the planet. The planet also has a vast ocean covering the majority of its surface, with the rest being occupied by “archipelago continents”.  Another notable feature about this planet is that it has a cloud of asteroid moons instead of an ordered major moon system.

### Moons (1)

 Mass
 Diameter
 Orbital period

### Solar system

The planet is located in a 3 star system and orbits the “A” star in the system, an orange dwarf. The star is in a binary with 2 red dwarf stars, there are 4 planets that orbit the “A” star in the system, 1 planet that orbits the binary red dwarfs, and 3 planets orbit all 3 stars in the system. The system is slightly above the galactic plane, giving the planet an impressive view of the rest of the galaxy. The one planet that orbits the two red dwarfs is visible from the “A” star. The two red dwarfs also orbit to the side relative to the rest of the system.

#### Solar system gallery

The following images have been split into 3 categories due to the positions of the planets in the system.

##### Solar system gallery (A)

The Orange dwarf of the star system. Its the "A" star.The first planet away from the A star, it is a hot desert.The second planet in the star system, its also another hot desert.The third planet away from the oange dwarf, its yet another hot desert.The fourth planet away from the orange dwarf, its a megaterra with multicellular life. Impressive.
##### Solar system gallery (B)

There are 2 stars in this gallery, they are refereed to as "BA" and "BB". "BA" is the main star out of the 2.

The main star of the sub-binary, its a larger red dwarf. Its "BA".The smaller of the two stars, it is reffered to as "BB".The only planet that orbits the sub binary of stars, its a Warm selena.
##### Solar system gallery (Around A - B)

The first planet around all three of the stars, its a frozen ice world.The second planet out around all three stars, it is a Frozen superearth with it being 7 times the mass of the Earth.The third planet away from all three stars, its a frozen subearth/microearth.All three stars.