Athens News: Every world in this system is adorned with countless ruins (planet-side and in orbit) of the space-faring arthenn.
Athens
Overall fame/aspect title: dangerous ecology of Nepyma, quarantined Helyme.
Abstract; summation of all major producing planets within this system:
(none yet)
System: Zelene
Solar System Collectives
Hierarchically Descending
Zelene
Nepyma
Helyme
Epho
Gaelon
---[Star Data]---
Stellar ID:
Class:
Radius:
Mass:
Luminosity:
Temperature:
Distance:
---[Planets]---
4
---[Moons]---
1
---[Asteroid Belts]---
0
---[Planetoids]---
###,###+
---[Comets]---
#,###+
_K#
(N/A) #.# sol
0.78 sol
(N/A) ## sol
##,### °K (##,### °F)
# AU
Zelene (year) AN
4,456 km
0.276 Earth Masses
0.8
N/A
32 °C / 89.6 °F
0.57 g
0.55 atm
0.8 AU
0.8 Earth Years
40.4 Earth Hours
---[Planet Data]---
Stellar ID:
Class:
Radius:
Mass:
Keplerian Ratio:
Luminosity:
Surface Temperature:
Surface Gravity:
Atmospheric Pressure:
Orbital Distance:
Orbital Period:
Day Length:
---[Status]---
Colonized:
Terraformed:
---[Moons]---
0
---[Rings]---
0
---[Artificial Satellites]---
0
---[Indigenous]---
N/A
Zelene (year) BM*
5,522 km
0.647 Earth Masses
0.768
N/A
-15 °C / 5 °F
0.87 g
0.84 atm
1.2 AU
1.5 Earth Years
44.4 Earth Hours
---[Planet Data]---
Stellar ID:
Class:
Radius:
Mass:
Keplerian Ratio:
Luminosity:
Surface Temperature:
Surface Gravity:
Atmospheric Pressure:
Orbital Distance:
Orbital Period:
Day Length:
---[Status]---
Colonized:
Terraformed:
---[Moons]---
0
---[Rings]---
0
---[Artificial Satellites]---
0
---[Indigenous]---
(arthenn, now vanished)
Zelene (year) CN
8,031 km
1.574 Earth Masses
0.77
N/A
-41 °C / -41.8 °F
1.0 g
0.98 atm
1.56 AU
2.22 Earth Years
70.0 Earth Hours
---[Planet Data]---
Stellar ID:
Class:
Radius:
Mass:
Keplerian Ratio:
Luminosity:
Surface Temperature:
Surface Gravity:
Atmospheric Pressure:
Orbital Distance:
Orbital Period:
Day Length:
---[Status]---
Colonized:
Terraformed:
---[Moons]---
0
---[Rings]---
0
---[Artificial Satellites]---
0
---[Indigenous]---
(arthenn, now vanished)
---[Planet Data]---
Stellar ID:
Class:
Radius:
Mass:
Keplerian Ratio:
Luminosity:
Surface Temperature:
Surface Gravity:
Atmospheric Pressure:
Orbital Distance:
Orbital Period:
Day Length:
---[Status]---
Colonized:
Terraformed:
---[Moons]---
1
---[Rings]---
2
---[Artificial Satellites]---
0
---[Indigenous]---
(arthenn, now vanished)
Zelene (year) DJ
63,539 km
(N/A) #.### Earth Masses
0.798
N/A
(N/A) # °C / °F
(N/A) #.# g
(N/A) #.# atm
2.96 AU
5.7 Earth Years
##.# Earth Hours
Note
Helyme is a post-garden world that once enjoyed an Earth-like oxygen-nitrogen atmosphere. It is still blessed with plentiful water but a generally cold climate (and extreme seasonal shifts courtesy of a 38-degree axial tilt).
Helyme is thought to be the homeworld of the arthenn, a spacefaring species that disappeared approximately 300,000 years ago. Precisely what happened to Helyme is still under debate. It appears a global extinction occurred, wiping out all native animal life forms more complex than zooplankton. Plant forms were not affected, but the lack of oxygen-breathing life caused oxygenation of the atmosphere. Plant life was reduced after lightning storms ignited global wildfires.
The leading theory for Helyme's devastation is an out-of-control biological weapon. For this reason, landing is strictly prohibited. The corporations of Illium have emplaced a network of quarantine satellites to dissuade would-be looters from landing in the crumbling cities.
Note
Epho is a rocky world with an atmosphere of oxygen and carbon dioxide. There are large craters scattered across its surface, obviously from hypervelocity kinetic impactors. Stretching between these locations are the shattered remains of magnetic levitation rail lines, which strongly suggests that the craters represent the former locations of arthenni mining outposts or other settlements. The equatorial region contains an extensive network of canyons formed by the planet's abundant liquid water.
TRAVEL ADVISORY: Epho's atmosphere is approximately 41 percent carbon dioxide at sea level. This is four to six times the level necessary to render most species unconscious within a few minutes of breathing it. Breathing masks must be worn at all times when on the surface of Epho.
Note
Gaelon is surrounded by an extensive ring system. The inner rings are composed of pulverized nano-manufactured carbon materials thought to be the remains of an arthenni helium-3 mining infrastructure. The few pieces of larger debris found indicate a materials technology at least equal to the current galactic state-of-the-art.
The outer rings consist of ice, silicate dust, and the odd bit of rock. Analysis of the debris often shows shock damage and evidence of rapid heating. Some para-historical theorists insist that the outer rings represent debris from a moon or moons destroyed by mass accelerator bombardment. This has been rejected by every reputable xenoarchaeologist; while it is theoretically possible to destroy a small moon utterly with dreadnought bombardment, no species sees a compelling reason to do so.
Note
Tidally locked to the star Zelene, Nepyma has the expected "hot pole" and "cold pole". Along the terminator is a thin band of nearly habitable terrain. Unfortunately, the local biosphere is based on a chlorinated oxygen atmosphere. It is not sophisticated, but it has proven highly dangerous.
The asari surveyor Verallas landed on Nepyma in 1684 to study the local ecology. Unbeknownst to the crew, a handful of native chlorine-fixing microbes passed through biohazard screening and entered the ship. The Verallas returned to the port of Nos Parnalo on Illium, where the Nepyman microbes escaped into a temperate environment with plentiful unused chlorine.
The microbes devoured the chlorides in the earth; as metabolic byproducts they produced toxic polychlorinated biphenyls (PCBs). By the time the infestation was contained, an area of nearly 30 square kilometers had been effectively turned into a toxic waste dump. Nos Parnalo had to be abandoned, accelerating the development of Nos Astra.
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伊馬棉結
Nepyma
Helyme
海爾輸入法
嗯為
Epho
Gaelon
蓋爾在
系統
Note
Zelene is a medium system with four planets.