Alternate Planets, Suns, Stars, and Solar Systems Thread

[rickyrab]

New solar system!

Sun: Amaterasu, mass: 1.52 Sol, luminosity: 4.33 L; temp: 7025 K
Planet 1: Uzume, mass: 0.82 earths, orbit per 1.22 years, rotation per 243 days, tilt: about 3 degrees. Was once earthlike, but runaway greenhouse effect put paid to that.

Planet 2: Izanami, 0.63 earths, temperature 13.7 C, orbit per 2.47 earth years, rotation per 20.8 hours; tilt is very low but quite wobbly. Earthlike. Diameter 10,603 km (Earth is 12,742); density is 6.03g/cm3 (Earth: 5.52).
**Moon: Jizo, 1.46 Earth moons, orbit per 17.0 days.

Planet 3: Izanagi, 1.37 earths, temperature 7.80 C, orbit per 2.65 Earth years; similarly wobbly tilt, but not as low as Izanami. Perhaps often in the 20s and 30s. Rotates once every 1.51 Earth days. Earthlike. Diameter 14,244 kilometers (as compared to Earth's 12,742); density is 5.41g/cm^3 (compare to Earth's 5.52).
**Moon: Tsukiyomi, 1.30 Earth moons, orbit per 26.0 days.


Planet 4: Susanoo, 3.77 earths, orbit per 4.22 Earth years, wobbly tilt, medium range. No moon, though. Rotation is 1.18 Earth days. Somewhat Earthlike, but more of an "ice/ocean world".


Planet 5: Ohoya Matsumi. 3.78 jupiters, orbit per 27.2 years. Rotates per 9.93 hours. Low tilt.
**Moons:
*** Inari, 1.32 moons, orbit per 5.11 days, Io like. Low tilt. Rotation 5.11 days; tidally locked.
*** Hachiman, 8.73 moons, orbit per 19.1 days. Marslike. Rotates once every 1.48 days. Tilt somewhat earthlike.
***Otohime, 5.84 moons, orbit per 34.4 days. Marslike. Rotates once per 20.5 hours; steep wobbly tilt.
***Kannon, 0.65 moons. Europalike. Orbit per 82.6 days. Rotates once per 1.03 Earth days. Slight tilt.

***Tenjin, 6.30 moons, orbit per 94.6 days. Marslike. Rotates once every 1.08 Earth days, steep tilt.

Planet 6: Fujin, orbit per 47 Earth years, 9.46 Earths. Uranus/Neptune like. Rotates every 17.2 hours.
**Moon: Raijin, orbit per 9.82 days, 3.40 moons, Titanlike. Rotation per 5.83 days, slight tilt.

Planet 7: Ryujin, 22.6 Earths, Saturn(?)like, orbit per 70.4 years, probably has several moons, but I haven't bothered to establish them. Has beautiful rings, too, but I haven't established those, either. Rotates every 10.5 hours, very steep tilt.

Planet 8: Idaten, 14.5 Earths, Uranus/Neptune like, orbit per 94.2 years, rotates once per 4.07 days, slight tilt.


Planet 9: Suijin, 20.1 Earths, Uranus/Neptune like, orbit per 123 years, rotation per 16.1 hours; steep tilt.

 

[rickyrab]

Sun: Amaterasu, mass: 1.52 Sol, luminosity: 4.33 L; temp: 7025 K

Planet 2: Izanami, 0.63 earths, temperature 13.7 C, orbit per 2.47 earth years, rotation per 20.8 hours; tilt is very low but quite wobbly. Earthlike. Diameter 10,603 km (Earth is 12,742); density is 6.03g/cm3 (Earth: 5.52).
**Moon: Jizo, 1.46 Earth moons, orbit per 17.0 days.

Planet 3: Izanagi, 1.37 earths, temperature 7.80 C, orbit per 2.65 Earth years; similarly wobbly tilt, but not as low as Izanami. Perhaps often in the 20s and 30s. Rotates once every 1.51 Earth days. Earthlike. Diameter 14,244 kilometers (as compared to Earth's 12,742); density is 5.41g/cm^3 (compare to Earth's 5.52).
**Moon: Tsukiyomi, 1.30 Earth moons, orbit per 26.0 days.

Planet 4: Susanoo, 3.77 earths, orbit per 4.22 Earth years, wobbly tilt, medium range. No moon, though. Rotation is 1.18 Earth days. Somewhat Earthlike, but more of an "ice/ocean world".

Civilization rose first on Izanami, the smaller but more densely packed world. Because the moons of both Izanami and Izanagi were closer and larger than Earth's moon, the tides were larger, and the first hop into outer space easier. While Izanagi came later, life on both worlds became sentient, leading to conflict between Izanamese and Izanagese countries eventually. When Japanese people from Earth came by and named the planets, several cities on Izanami were licking their wounds from Izanagese bombardments, but a fragile peace was holding.

 

[Timmy811]

Trojan Earth

POD - Jupiter like many Gas Giants drifts into a closer orbit to the sun.

It settles in at one AU. Earth is relatively unaffected becoming a Trojan planet of Jupiter, orbiting at one AU and 60 degrees behind Jupiter.

Venus, Mars and Mercury however are smashed together, forming the 2nd Trojan planet. 98% the mass of the Earth and a density of 5.07 g/cm3 it is a true twin of Earth and a living world. It orbits 60 degrees ahead of Jupiter.

 

[water123]

Trojan Earth

POD - Jupiter like many Gas Giants drifts into a closer orbit to the sun.

It settles in at one AU. Earth is relatively unaffected becoming a Trojan planet of Jupiter, orbiting at one AU and 60 degrees behind Jupiter.

Venus, Mars and Mercury however are smashed together, forming the 2nd Trojan planet. 98% the mass of the Earth and a density of 5.07 g/cm3 it is a true twin of Earth and a living world. It orbits 60 degrees ahead of Jupiter.

Wouldn't Jupiter's gravity tug earth around a lot, possibly making it go out of the habitable zone, or even out of the solar system altogether?

 

[Utgard96]

Awesome thread, this. I think I should contribute to it by posting a short description of a world and scenario I've been working on on and off for a while now. Keep in mind that I'm primarily a writer, so there are likely huge scientific inaccuracies in it, but improving that is part of the reason I'm sharing the project.

The following is an excerpt from the comprehensive setting bible I'm working on, and once the full thing is done I'll likely post it by instalments in a separate thread.

Hume
The Sons of the Steel Bird and Their Lands

Geography​

The world of Hume orbits a K5-class (orange dwarf) star at a distance of roughly 50 million kilometers, completing an orbit in 72 of its days, each of which is slightly longer than Earth's. The orbital period is called a cycle, and fulfills the functions of both the Earth month and year. Hume is the only full planet in its star system, and has no moons, but there is an asteroid belt some distance outside its orbit that includes several dwarf planets.

The planet is at the outer edge of the habitable zone, and as such is somewhat colder than Earth. Even on the equator the temperature vacillates around 5-10°C (~40-50°F), barely warm enough to grow the hardiest of plants, and the further away from it you go the colder it gets. Because there is no axial tilt to speak of there aren't any real seasons, though as the planet's orbit is slightly irregular the temperature does change slightly depending on where in its cycle the planet is.

Whereas Earth and planets like it are dominated by sea, and have only a minority of its surface covered by unconnected patches of dry land, on Hume it's the other way around. All life on the planet is concentrated around a small number of endorrheic drainage basins, which are separated by endless miles of cold, barren desert.

Flora and fauna​

Hume's flora can be divided into two categories: the native vegetation that survived terraforming, and the earthly plants introduced by man that have come to dominate much of the planet. The former group, the native plants, are probably the most interesting, as while Hume did have an oxygen and carbon based ecosystem even before terraforming, much of its plant life contained chemicals that either do not exist or are very rare on Earth. Most of these chemicals are poisonous to humans, but many of them only when consumed in large amounts, and in smaller amounts these can have stimulating effects on the mind and body. Thanks to this, the native flora was preserved for study by pharmaceutical companies during terraforming, and with some small genetic modifications done immediately before the Fall, it's able to survive in the Earthlike environment of modern Hume.

Along with the modifications to native flora, earthly plants such as bluegrass, oats and conifers were introduced to the planet's ecosystem during terraforming, and thanks to being more well-adapted to the new environment, these were able to out-compete the native plants in most areas. Today rye and oat fields cover most of the river valleys, and coniferous forests are commonplace in the mountains, but the native flora still goes strong, particularly in marshes and similar.

The fauna of Hume is notable not so much for its great variation as for its scarcity. There was not yet any animal life above the microscopic scale when terraforming began, and the first humans brought with them only their pets, but thanks to the Maker's providence (so the priests would have you believe, anyway), a couple of those pets were sheep, house trained by a family that happened to be travelling on the ship at the time of the Fall. There were also sheep dogs, huskies, terriers, cats, and guinea pigs, and while some of these were eaten to stave off starvation during the dark first cycles, the ones that survived were made to breed rapidly (particularly the sheep), and now make up the backbone of Hume's fauna.

Agriculture​

The lack of large herd animals in comparison to Earth posed a problem, and while mechanised agriculture could easily be pursued when the reactor was still running, the Great Darkening forced the Humans to adopt a system of mandatory labour, where all citizens were made to work the farms or push carts for two months out of the year, and labour rotated between all of the citizens. This system gradually whittled away over the next couple of hundred cycles, as the administration first exempted those citizens who could pay for a replacement, then sold land on the then-frontier to individuals (rather than holding it collectively as had been done before), and finally allowed said individual landowners to pay for their own workers rather than use citizens on their mandatory labour duty. This left a huge underclass of carmen, farmhands and sharecroppers who are, in effect, held in serfdom by their landowners.

The materials that have been made so far include a map of part of the world (sadly not my work, although I did commission it), an MotF entry and a short story inspired in part by Lovecraft and in part by an old Swedish folk legend. I'm planning on using the setting bible as a means to open up the setting to other writers as well as role-players, but that's all in the future as of now.

 

[scholar]

I can't believe I haven't brought this one up, but here's a contribution I made to AAPA.

The Fulgenzio System (two posts of history, one post of the solar system).

 

[Maxwell Edison II]

I think you might have messed up the luminosity-distance-insolation formula. If you are twice as close to a star, you will receive four times more sunlight, consider each distance the surface area of a sphere.

Fulgencio I actually receives 0,13^-2 * 0,26 = 15,38 times more light than the Earth, and Fulgencio II would receive 0,32^-2 * 0,26 = 2,54 times more.

Mercury receives 10,6x at perihelion, 4,6x at aphelion, and 6,674x at its semi major axis.

Venus receive 1,91x at its semi major axis.

Other than that, I quite liked the exposition on the system, though I fear if I bite into that huge timeline, I could be stuck for days...

 

[1.36]

Here's the Fire Nation for you guys! It took me just over 3 hours in real time to finish this...so yeah.

Next up, the Earth Kingdom. *shutter*

 

[Utgard96]

Here's the Fire Nation for you guys! It took me just over 3 hours in real time to finish this...so yeah.

Next up, the Earth Kingdom. *shutter*

If three hours of mapmaking turns you off to the idea, you probably shouldn't attempt anything more advanced than Worlda style.

 

[1.36]

A detailed Avatar world map is finally finished!

I've already posted it in the map thread, but I'm also posting it here for future reference if anyone needs it.

 

[Pragmatic Progressive]

Crossposted from the map thread, I think it fits better here... Are you planning on any more of the Huitzilopochtli-verse? I would be especially interested in an Atlacamani basemap (with orange or so for Terra Nullus, of course, even at the risk that vast swathes of it might look like commie)!

New version of my map of Tloxipeuhca, the Ammonia moon.

Ruby rivers, sanguine seas,
forests with magenta leaves,
onyx tundra's fans of night,
reach ever for the azure light

Six-foot starfish bask in sleep
before the bloody, briny deep.
Cliffs of nitre 'neath the sky,
behold the emerald nocturne eye

Frigid cyclones lash the shore
of tyrian jungles that the pour
of frozen azine rainfall feed,
whose yellow soil and purple weed...

...smell of gunpowder, garlic and fish.

(If you live to take a whiff that is)

View attachment 239308

 

[Hapsburg]

All continents hand-drawn. Most islands hand-drawn. Some islands and coasts taken and modified from the Earth QBAM. Original image resized for smaller fit, with borders and locations added. The planet is the setting of my current D20 Future campaign, set in my Unionverse universe:

Keystone, a lonely backwater planet in the outer rim of the human-colonised space. Keystone is an old, roughly Earth-sized planet with Earth-normal gravity and atmosphere orbiting a Class G star of 1.1 solar masses.
Orbital Distance: 1.05 AU
Orbital Period: 391 Earth Days
Equatorial Radius: 6,416 km
Day Length: 24.1 Earth Hours
Atm. Pressure: .994 atm
Mean Surface Temp: 13 °C
Surface Gravity: 1.07 g
Mass: 1.01 Earth Masses
Satellites: 1

Early in its geological history, Keystone was struck by a moon-sized object 1/12th of its size in a head-on collision. The impact crater can still be seen in the form of a large, bowl-shaped ocean. The impact kicked tons of debris into orbit, some of which coalesced into its largest natural satellite. Geologists have determined that the debris formed several smaller satellites, but during the past five billion years they either were ejected from orbit or crashed into the surface. One of these made a second large impact on a large island in the centre of the impact ocean some four billion years ago. At present, Keystone has one natural satellite, named Voussoir.

The planet's age has weathered down most of the mountain ranges, leaving very few peaks near as high as Earth's Mount Everest. The tropics are mostly swampy with some forests, and dotted with large saline lakes. The northern subtropics are covered in grassland plateaus, with taiga and tundra further towards the frozen polar arctic. The south is much the same, but somewhat warmer until one reaches the Great Ice Sea on the southernmost continent.
Its climate is mostly arid scrubland and prairie in the subtropical regions, with swamps in the tropics and tundra in the far polar regions. Due to the aridity, it is not heavily forested, with much of the planet's native vegetation being grasses, shrubs, and mosses. Trees were heavily planted by settlers, and now mostly cover the northern subtropics and the tropical belt. Calm, narrow seas and one vast ocean separate the expansive, dry continents.
The planet's age has led to a more stable volcanic geology and largely eroded the vast mountain ranges. Rainfall is light but even, lending to the world's productive agricultural economy. It has also staved off the worst effects of desertification.

Evidence exists that a sapient species once lived on the two central continents, with several competing civilizations. The earliest material culture remains are dated to roughly 60,000 years ago, with the most recent being dated to 5,000 years before human discovery and settlement of Keystone. Local folklore has it that the native race still lives, wild and savage, in the hinterlands and frozen north. But no anthropological evidence exists to show that this is true. It appears that the entire species went extinct over the course of several thousand years and its accompanying civilizations disappeared. Historians and archaeologists specialising in Keystone point to some natural catastrophe, like climate shift or increased volcanism, combined with widespread warfare as the reason for their extinction.

Upon initial settlement, the release of Terran fauna into the wild was a significant ecological issue. After considerable effort on the part of the colonial government, the invasive wildlife was curtailed and brought into equilibrium with native fauna and flora. The largest impact that has been made is the presence of T. rex populations, descendants of clones released illegally by sports hunters centuries ago, which roam the northern central continent.
Its population of just over one billion is primarily descended from Russo-Terran and Germanic settlers that colonised the planet in the mid-27th century. It has been inhabited by humans for over six centuries, expanding from an initial settlement of 5,000 people to include several major cities and thousands of towns. Much of the population is centred on tropical and southern subtropical coasts and river valleys, with outlying concentrations in the northern subtropical region and sparse settlement of the arctic polar areas.
The world's economy has long been focused on the export of agricultural products and petrochemicals. In recent years, an expanding information technology sector and the prestige of the Keystone Institute of Technology in high-level physics research has broadened the global economy. It is, however, largely unindustrialised outside of the rudiments of heavy industry for basic defensive self-sufficiency. The biggest investor outside of state-supported industries and infrastructure is the McGrady Corporation, a galactic business conglomerate.

Keystone's culture varies somewhat from region to region, but it is mostly agrarian, clannish, and reflexively conservative--like many colonies. Its success in agribusiness and long history of settlement has led to it being viewed as a flagship colony, a powerful success story for the otherwise backwater Outer Rim.

 

[Hapsburg]

Recent events on Keystone (i.e., recent events in the game):

A recent wave of political events have shaken the planet's stability to its core, however. It began with the assassination of Richard Hawking, Prefect of Dusken, in the city of Hauberk in early June of 3280; Prefect Hawking had made great strides in cracking down on banditry and organized crime in his prefecture, and had successfully lobbied for Fort Dusken to be made the headquarters of the State Security cadre on the planet. Later that month, Governor Rufus T. Blackwall was found murdered in a restaurant, his office was bombed, and his home was assaulted and razed. Interim governor Vasili Cooper vowed to investigate the coordinated attacks. Finn MacDougall, manager of McGrady Corporate interests and holdings on Keystone, was accused of orchestrating the new political attacks. Before he could indicted, however, he was assassinated amidst a gang war in Lakeside City. A conflict that would prove to be for naught when a terrorist attack on Lakeside saw the detonation of a nuclear device. Over 100,000 people were killed. In response, the Central Galactic government declared the planet a Quarantine Zone and ceased all trade and information flow to and from the planet. While forces were being organized to occupy the world and put it under government control, the breakdown of centralised power on Keystone led to most Prefects declaring themselves independent warlords. In theory, they all acted 'in the name of' the Colonial government. But in practice, the planet was flung back to the feudal era.

 

[Timmy811]

Wouldn't Jupiter's gravity tug earth around a lot, possibly making it go out of the habitable zone, or even out of the solar system altogether?

As long as it's 60 degrees ahead or behind it will stay there as if anchored by chains of adamantine steel.

 

[Undeadmuffin]

An archipelagos planet named Aurora.

 

[dreadnought jenkins]

An archipelagos planet named Aurora.

View attachment 244816

Thats a rather oddly inversed Mars map you`ve got there.

 

[Undeadmuffin]

Thats a rather oddly inversed Mars map you`ve got there.

Exactly, but it turn out to be interesting so i cleaned the border and recolored it
(I took the map in the alt history wiki, if i remember correctly)

 

[LNSS]

Blank Space Map

Here's a blank spacea map, each segment supposed to be roughly 5 LY, but since it's blank it can be anything you want I guess. Dot in the middle is Sol.

 

[SpanishSpy]

Map of Mars from my and Blackjack555's timeline Emancipation and Exodus made using a template found on the wiki.

 

[Rosella]

Alternate Solar System

Another different solar system.

Habitable Objects:

Mars: A tiny world, heated by the sun mostly.

Earth: Manly the same, but the Moon is a bit larger and further out- also has some tiny salty lakes.

Venus: Mainly the same. Small moon, a melted Europa.

Jupiter is about 6 J. Masses. has seven moons, whose orbits manage to interlock just right- they are all temperate.