I’ve been trying to do this for a long time, but I can’t find a tutorial, or someone to explain it to me a little bit.
I would make the Solar System look like 1:1 but it wouldn’t be. The sun and planets would be reduced, but as the player slowly approached, the planet or sun would get bigger and bigger until the surface was touched, where the enlargement would stop.
Basically, I would like to create some kind of space illusion.
Yes, and also change from a round planet to a flat terrain as you land.
Much better idea than many people who ask about universe modelling on here.
“I want to model the entire universe, using Niagara particles for the atoms” ( or something like that )
Not only would be incredibly boring, but also landing on a full size planet would be very boring. Vast expanses of terrain where absolutely nothing is happening. Much better to just make people think it’s they are in a universe…
Making something get bigger as you get near to it is pretty easy, switching from space to planet as you land is a bit more tricky, but certainly possible. For instance, you have all the reentry burn-up effects to cover the transition etc.
That’s a good idea I thought about, but I’m curious how it would work in muliplayer?
Yeah, totally different thing 
Same thing though. In terms of smoke and mirrors.
In space there is no way you’d be able to spot the IIS which is in low earth orbit (or any other satellite) from afar.
Probably no more so than you can spot it going around in circles above our heads with a tele lense, luck, and a 10m exposure of the moon.
In other words.
Just prevent people from getting anywhere near the planet’s orbit to where the player’s ship is more than a pixel or 2 on screen without being forced to land.
Conversly.
Probably allow them to park in low earth orbit a bit before they are allowed to leave.
Should allow them to see who is around and avoid them while the other guy cant really do the same.
Yes, increadibly one sided, thats the point though. You want them to kick off from orbit without some asshat spawn camping around the planet…
There are plent of examples out there…
Bad ones
Star citizen (watch YouTube, avoid the scam), elite dangerous.
Good ones
no man’s sky, astroneer (not mp but still).
They all do it different but similar.
Physics whise they all do it wrong, and thats because doing it right is boring unless your ■■■ is on the real rocket.
And thats probably got more to do with the fact that even if you are Musk your ■■■ is only on that rocket maybe a max of 4 times in life 
Videogames are generally repetitive by nature, so doing it right would just kill your player base/ratings…
As an aside, maybe Boeing can start making space sims so that their stuff works on them?
What do you think about this?
For the “planet” to be divided into chunks. As the player approaches another chunk, the closest ones are loaded. quite simple as it sounds 
Its a lot of chunks.
Usually you have to make a system that aggregates pieces of a planet in different fashions. Think of it as
Icosahedron, dodecahedron, etc…
