Here’s my notes on this. I saw different posts covering parts of this, but I want to try and capture them all here for some traveler out there.

Before you End the Expedition:

• Note that you’ve accumulated a lot of quicksilver currency. You can use this at the vendor near the floating mission computer to unlock cool stuff. Quicksilver is the hardest currency to find, so you don’t want to waste it. Any items you unlock with Quicksilver, can be reclaimed at the same vendor freely on any other save file.
• Note that each tier of the Omega expedition has an optional achievement for scanning aliens, minerals, and plants on each Rendezvous planet. If you missed these and want to finish them and you can’t remember where those planets are, don’t worry, all you need to do is visit the portal in a space station and view the previous space stations you’ve visited. You’ll notice that some of these will have extra text on them like (Rendezvous #1). That will take you to the star where the Rendezvous planet is. Look for a lot of bases which are the purple icons you see on the planet surface from space. That should get you on the right planet.

And now assuming you really are ready to finish:

• Did you transfer important tech upgrades from your suit/multitool/ship?
  • Then make sure you transfer it back. Your main save does not have them now. You need to send them back!
• Transfer any other items back that you want to keep. If you’re new to New Man’s Sky, I’d suggest keeping rare eggs you received, Good S-Class upgrades you need, and especially any upgrade modules for your freighter (like +1 inventory to freighter, because freighter stuff is hard to find.
• When you arrive back in your main save, anything you stored back in the Expedition terminal on the Anomaly will be waiting for you, kind of like a locker.

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I was doing the Atlas/Artemis missions. When I portaled to a new system, I didn’t know it would break all my stuff so I freaked out. I spawned on a very radioactive planet and almost died. I found my ship just in time. Fixed enough to get to the space station and warp back to my hone base. Now I seem to be stuck on the Atlas mission, and every time I talk to the atlas it asks for a heart of the sun, and nothing happens. I go and talk to Polo and Nada and they’re no help. I can’t help but think I messed up by warping home. Anyone ran into this?

Dont buy slots! they will cost you hundreds of millions! Instead scrap exotic ships and it will give you 1-3 Starship Storage Augumentations.

Best way to farm exotics is to find a Trading Outpost on a paradise/low-storm planet in a tier 3 economy system. Storms are a bother if you have to stand outside and oversee all 7 ship landing pads.

Then just wait for any exotic to spawn and instantly buy it. they cost from 2M to 20M.

After buying it fly/teleport to the space station and scrap it. you’ll get the Storage upgrades along with random upgrade modules and valuable scrap. This is A LOT cheaper than directly buying slots but takes some time.

You can also try to do it in a space station but as soon as you scrap one ship then your default ship will occupy a pad and lower your chances of getting a exotic.