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Basically assume Warp shenanigans spit out the planet of Venus during the fiftieth year of the Great Crusade and said Warp shenanigans transport our modern day 2020 Earth to Sol system replacing Venus. Assume that closer proximity to sun by some warp magic doesn't fry us.

Assume also that the Emperor remembers and recognizes the 2020 Earth as some sort of past Terra.

What happens now?

Stipe mine for resources and conscript the population

Well, we're 100% on the Tech-Heresy-o-meter, and have no STC to speak of. Would most likely be a classic case of "Do you surrender? No? Ok!" followed by systematic genocide and then picking out the non-heretical technology from the smoldering ruins.

Could you imagine what they would think of the internet. Within 5 minutes twitter could be ablaze with people cancelling the emperor.

I think a lot would depend on if the Emperor himself and his perpetual buddies are also duplicated, but generally I would guess either:

A) We're made to Comply with the Imperial Truth, stripped of anything of value and turned into a hive world

or

B) Exterminatus due to the Warp shenanigans

On the other hand big E might have some use for nearly 8 billion genetically pure, non-psyker humans that were never touched by warp entities. I mean we have no hint of Abhumans or Mutants in the WH40k sense at all.

I think a great deal of how it would go would be based on which legion was assigned with the task to bring us into compliance?

Some of the more 'Civil' Legions might have a chance of dismantling our governments, and establishing a new order with minimal violence.

If its the world eaters...night lords....iron warriors....etc we've totally screwed lol.

I think modern Earth would be of interest to the Imperium because of our almost complete lack of psykers. Is it our bloodline, is it local warp conditions, do we have some reliance to chaos and the warp?

So if the Imperium stumbled across us I think there'd be a period of observation before the moved.

But to the OPs question if 21st C Earth showed up in 30k (or 40k) Sol System the Emperor would have to order HANDS OFF. Because we're a part of his past and any changes in 21st C Earth can/would affect trillions of our descendants in the far future and he has no way of knowing if the Earth that appeared is the real one that will have to return to its place, or a fake copy to confuse him. So I'd expect a blockade and a monumental effort to put a fake star pattern in place to keep us from noticing. And an equally massive effort to send us back before the whole timeline is boinked.

Wouldn't that mean 2 emperors?

Hah, Imperium would be OP.
Admech would be overjoyed to examine everything.

Imperial Scout #1:

"sir! reporting sir! These humonoids put combustible materials in tight spaces to propel themselves with the kinetic energy the volatile reaction produce. They worship someone called Beyoncé/iPhone(we are not sure sir). They structure their society where everybody appears to be equal and free but are not really equal or free and they keep trying to control eachother an masse. They keep slaughtering each other in the millions over imaginary-man-in-the-sky"

"what are your orders. sir"

Imperial beurocrat #1:

"What is this madness...!? Are they some sort of orks? No matter... We don't have time for this. Deploy xtermiantus and begin the penal mining colonies programme."

Is this about the original topic or people just making their own social commentary? The anti-religious stuff is getting tiring.

 Ginsu33 wrote:
Is this about the original topic or people just making their own social commentary? The anti-religious stuff is getting tiring.

...the one post with anything resembling an anti-religious note is getting tiring? Alrighty then...

 Dysartes wrote:

 Ginsu33 wrote:
Is this about the original topic or people just making their own social commentary? The anti-religious stuff is getting tiring.

...the one post with anything resembling an anti-religious note is getting tiring? Alrighty then...

I'm referring to dakka in general, unfortunately.

It would probably be glassed / bulldozed to make way for planet-wide paper mills and cardboard box factories to keep the insatiable Administratum and Munitorum fed with the most basic and mundane (yet essential) supplies.

 Pyroalchi wrote:
On the other hand big E might have some use for nearly 8 billion genetically pure, non-psyker humans that were never touched by warp entities. I mean we have no hint of Abhumans or Mutants in the WH40k sense at all.

You obviously haven't seen some of the people around the UK south-west, Forest of Dean area..

Minus space travel and military technology, the Imperium would get access to vastly superior tech.

 iGuy91 wrote:
I think a great deal of how it would go would be based on which legion was assigned with the task to bring us into compliance?

Some of the more 'Civil' Legions might have a chance of dismantling our governments, and establishing a new order with minimal violence.

If its the world eaters...night lords....iron warriors....etc we've totally screwed lol.

IW depend, if Perturabo shows up and we basically debate him to death about the advantages of democratic structures and englightenment , he'd probably like us enough to just build a fort or two, conscript a bunch and call it a day.

Me: "Hey Fulgrim, check out my browser history".
Fulgrim: "Ah, you are truly a follower of slaaneshy excess!"

What would EOM and Primarchs along with Astartes think of our world, our cultures, our ways of life, our societies etc...?

 Tyzarion_Kronius wrote:
What would EOM and Primarchs along with Astartes think of our world, our cultures, our ways of life, our societies etc...?

Some Primarchs or odd ones aside, I assume most of them would just laugh at our puny military options and weak leaders?

Statistx wrote:

 Tyzarion_Kronius wrote:
What would EOM and Primarchs along with Astartes think of our world, our cultures, our ways of life, our societies etc...?

Some Primarchs or odd ones aside, I assume most of them would just laugh at our puny military options and weak leaders?

Some might get a bit sad over how incredibly selfish some people are?

I wonder how Primarchs, Astartes, etc... would react to 21st century technology like computers. Thirty to forty millenium in the past with tech that doesn't require lobotomized suckers to be made into brutalized slave servitors.

 Tyzarion_Kronius wrote:
I wonder how Primarchs, Astartes, etc... would react to 21st century technology like computers. Thirty to forty millenium in the past with tech that doesn't require lobotomized suckers to be made into brutalized slave servitors.

Looks like tech heresy that falls to a virus super easy. Plus in the scheme of things it's just resource inefficient. Why use valuable metals when you have thousands of people to use instead?

They'd consider us naive. In the 40k (or 30k) universe aliens, space demons, sentient computer viruses, and every other horror from beyond space is very very real.

Besides such esoteric threats we're also defenseless against 'normal' space based weapons.

Our computer network and electric grid could we wiped out be a few EMPs in the upper atmosphere. Our whole planet could be rendered uninhabitable with an asteroid crash or two. And we have no way of defending ourselves.

They'd probably hit with some combination of space threats just to toughen us up and show us what's what.

my gut feeling is the planet'd be deemed off limits and Malcadore, whose always had an intreast in preserving history, would make it a kind of personal reserve