It's been so bloody long I've forgotten.

You cannot be attacked or have your planets stolen while you're either under rank 20, or for how long of a timeperiod when it runs out?

I think the time period is 2 weeks or until you've passed 20, whichever happens first.

Yeah I think it's rank 20 and two weeks.

Your planets are immune to attack for 2 weeks, or until you hit level 20. Likewise you cannot invade planets until you are level 20.

Important note though : neither of those apply to an account reset, you also do not get another aegis shield artifact.

Ah, right. You can still be attacked sub-20. I think pvp is possible starting rank 4 or 5

Not rank 1?

Rank 1 is only missions and NPCs

What if you still have your Aegis from the first time around?

Oh ok, well you learn something new every day I guess.

I believe it's been said in various resetting threads (and please correct me if I'm wrong here) that you don't keep your aegis even if you have it left over.

Good thing I never plan on resetting. lol