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So Mars and Terra have long been talked about. But what about Mercury, Venus, Saturn, Jupiter, Neptune, and Uranus? (Not missing anything am I? ).

Have they been terraformed? Are there military outposts on their moons? What is going on in the solar system?

You forgot Pluto which is a listening station.

In the Custodes codex, they have a solar map layout with most of the important planets and other celestial objects

pm713 wrote:
You forgot Pluto which is a listening station.

Pluto? What’s a Pluto?

Well Venus is an industrial world which used to be ruled by War Witches and their armies of Litho-Gholems... what a Litho-Gholem is I have no idea though.

Maybe some sort of chemically fashioned facsimile of a man designed only to kill...

I can't remember if it's Jupiter or Saturn, but one of them is orbited by some impressive dock yards.

The grey knights like to hang around on Titan, one of saturn's moons.

And of course the sol system is always described as being the most heavily fortified system, whatever that may mean to you.

Pluto is where the alpha legion did some nonsense, if I remember right.

 amazingturtles wrote:
The grey knights like to hang around on Titan, one of saturn's moons.

And of course the sol system is always described as being the most heavily fortified system, whatever that may mean to you.

Pluto is where the alpha legion did some nonsense, if I remember right.

What it probably means is : starforts everywhere. EVERYWHERE

When I was younger, the Solar System had 9 planets.
You whipper-snappers with your only 8 planets nonsense.

Oh, and the Grey Knights don't just hang out on Titan, that is where they live.

Engrenages wrote:

 amazingturtles wrote:
The grey knights like to hang around on Titan, one of saturn's moons.

And of course the sol system is always described as being the most heavily fortified system, whatever that may mean to you.

Pluto is where the alpha legion did some nonsense, if I remember right.

What it probably means is : starforts everywhere. EVERYWHERE

Sol is fortified massively. The star forts, entire battleship sqaudrens and the at astaroid belts, with hidden sensors, torpedo positions, weapons systems and fighter bases etx.

The luna fortress, now home to sister of silance in top.
Terra had a huge amount of orbital weapons platforms too.

Sol basically is one giant grinding layers that designed to reduce your force so that Terra can hold and you get hammered in ass by reinforcements.

 Galef wrote:

Oh, and the Grey Knights don't just hang out on Titan, that is where they live.

They can do both!

More on topicly, I do think i remember that Jupiter is where the major shipyards are, and that Mercury is pretty much still inhospitable and good for only mining. Not sure about Neptune. Poor neptune. I can never remember anything about you.

Nothing important on Mercury, Uranus and Neptune don’t have a lot going on.

 Ustrello wrote:
In the Custodes codex, they have a solar map layout with most of the important planets and other celestial objects

I can only remember two facts about 40ks version of Ganymede.
One - the Adeptus Mechanicus (a faction that will happily sacrifice billions of lives in exchange for even a scrap of technology) abandoned their warp-core research after seeing what happened to Ganymede.
Two - the following quote is regarding the Contagion of Ganymede:

Henceforth no man shall set foot upon the world, and all around shall be set sentinels to ward away unwary spacecraft. We must accept that this place is lost to us forever, and is now the eternal habitation of abomination.

Sol is just flat out weird, and has been for millennia - used to be pre-Great Crusade era under Xenos control for most of the Age of Strife, with Fortress Mars remaining inviolable whilst the Cradle was pillaged until the Omnissiah returns to the Red Planet.

If Earth is referred to as Terra, and things from there as Terran, then you would read Jupiter as being Jove and Jovian. BFG has the Jovian Docks are the biggest shipyards in the Imperium with the largest STC system for this kind of vehicle (there are more advanced systems, but as those designs are found to be flawed or lost, they revert to the Jovian patterns you think of as being the Imperial standard warships).

Diemos, one of Mars' moons (Greek for Panic, the two moons that orbit Ares, Mars, the God of War are Fear and Panic) has been relocated to orbit Titan, one of Saturn's moons. Titan is a strange world in itself in real life, being almost Earthlike in some qualities but using methane rather than water. It might even have life in our era (there are methane ice beds that have ultraspecialised organisms that live in them here on Earth), but almost certainly doesn't in the 41st Millennium.

Looking at the Custodes chart, I'm not sure if there is a Custodes watch fortress orbiting Mars, or a station for the Mentor Legion. A Marine chapter dedicated to testing new weapons and equipment.

Sol is humanity at it's most paranoid, but not at it's best. The system has been ruined, over and over again, then reclaimed and fixed, then ruined. Mars is a wasteland of red dust, but it used to be green and fully terraformed. Earth has no blue any more and is a dry planet - the seas boiled away in eons past. During the Age of Strife it was the plaything of alien overlords and forgotten by the new homeworlds of humanity - no doubt Ophelia is a better monument to all humanity can be in dedication of one cause, Terra is just sacred for nostalgic reasons and because the Imperial Palace is there.
It's a squalid nightmare that manifests the very worst of the Imperium, almost everywhere is better than there - which is why people left and stay away. Whole system is insane, and of full of even crazier tourists and pilgrims.

There's also artefact kappa-mu that's in orbit between Terra and Venus; a black 30 some km diameter object of unknown material that is impervious to imperium weapons.

And there's the Comet; another object this time in eliptical orbit to Terra that Big Daddy E intercepted after the Unification Wars for the sole purpose of enshrining his victory which pleasures him greatly.

Saturn is where the massive ship yards were (used to be called the Saturnine fleet), in 40k the moons are given over to the Inquisition with a prison complex on one moon, various fortresses, the Grey Knights Monastery and the outer most moon being given over to ship yards/docks for the I and GK forces.

The rings of Saturn are / were also full of strongholds, facilities and the like which spawned the Solar Auxilia.

Regarding Sol and water, I did a rough calc ages ago indicating that in order to cover the planet in concrete to a depth of several storeys, which is effectively what has happened, then all the planetary free water was needed to hydrate the concrete. Same order of magnitude at least.

 Flinty wrote:
Regarding Sol and water, I did a rough calc ages ago indicating that in order to cover the planet in concrete to a depth of several storeys, which is effectively what has happened, then all the planetary free water was needed to hydrate the concrete. Same order of magnitude at least.

I seem to remember someone doing calculations on an Ecumonopolis (I think that is the word for a city planet), and the sheer heat generated by all the bodies, industry, buildings etc would make it unbearable!

I wonder, with Sol... if all the materials brought in from outside the Solar System would cause any planets (especially the small moons) to change in mass and therefore gravity. It sounds ludicrous, but when you think of the years and technology and effort involved it's not so outlandish.

TarkinLarson wrote:

 Flinty wrote:
Regarding Sol and water, I did a rough calc ages ago indicating that in order to cover the planet in concrete to a depth of several storeys, which is effectively what has happened, then all the planetary free water was needed to hydrate the concrete. Same order of magnitude at least.

I seem to remember someone doing calculations on an Ecumonopolis (I think that is the word for a city planet), and the sheer heat generated by all the bodies, industry, buildings etc would make it unbearable!

I wonder, with Sol... if all the materials brought in from outside the Solar System would cause any planets (especially the small moons) to change in mass and therefore gravity. It sounds ludicrous, but when you think of the years and technology and effort involved it's not so outlandish.

and the massive increase in the many layers deep on concrete, after concrete, after building phase might of increased Terras gravity a fraction?
add its mining, the palace, the massive structures and so?

You can only increase gravity by adding mass. Moving stuff around on earth (and even turning dirt and water into concrete) wouldn't actually add mass, it just moves stuff around. To adjust the gravity well large amounts of material would need to be brought down from orbit.

It does mention in one of the Grey Knights books that the core of Titan has been injected with super-dense materials to give it an Earth-like gravity.

Being the most heavily fortified system in the galaxy Sol is very busy. Titan is home to the Grey Knights. Pluto has a listening post as an early warning system. There are lots of star forts, the Phalanx itself is often there. Artefact 9-Kappa-Mu is a thing. http://wh40k.lexicanum.com/wiki/Artefact_9-Kappa-Mu The moon is a highly strategic important position, holds a naval base and is HQ to the Sisters of Silence and Battlefleet Solar. Most of the rest are seemingly used for resources and mining. And lots had uses during the 30k period.

 Lion of Caliban wrote:
Being the most heavily fortified system in the galaxy Sol is very busy. Titan is home to the Grey Knights. Pluto has a listening post as an early warning system. There are lots of star forts, the Phalanx itself is often there. Artefact 9-Kappa-Mu is a thing. http://wh40k.lexicanum.com/wiki/Artefact_9-Kappa-Mu The moon is a highly strategic important position, holds a naval base and is HQ to the Sisters of Silence and Battlefleet Solar. Most of the rest are seemingly used for resources and mining. And lots had uses during the 30k period.

From a recent novel.
Emparors legion.

Luna also has vast ship breaking yards as well as docks. They strip wrecked warships and other vessels that too damaged to no longer useful etc and recycle the hulls and materials for reuse.

Its a heavily fortified system and yes extremely busy but there's long designated trade lanes, like a road system, guarded vast mine fields guard titans area with patrol ships and secret routes in and out.

Theres check points, fleet patrols, custodes, imperial warships, inquisition and others coming and going all the time
Many thousands of traders, pilgrims and so ships come and go.

Mars will have own trade lanes and comings and goings.

Sol is like a giant traffic jam of space ships.

The Sol System would have to be a busy hub of activity, the population is in the 100s of billions or more and there's no where to grow food. Yeah soylent green, synthigrul etc but you still need an input into the system. So assume hundreds of grain ships just for starters.

Not to mention black ships, pilgrims, administration, nobles... And every ship has to be checked from stem to stern by a dozen security agencies.

Recently John Blanche has some stuff about Venus, IIRC it's the biological equivalent of Mars. Jungles filled with bizarre creatures and Adeptus Mechanicus Biologicus experiments.