man u have infinite patience.I reached there once but my ship got shot down immediately.Took me a hell lot of time even to reach there.I dint try to go back and stopped playing the game.
Not like that, you need to place colonies and make allies as you advance, when you die you will respawn at nearest colony.
Steps to take-
1.Get all badges(takes time, but worth it).
2.Load cargo with 18 different lifeforms needed to completely upgrade a planet to max t level(t3). A special badge increases the capacity of your cargo hold to hold a lot of objects.
3.Buy a lot of weapons, load as max as you can. Also buy all of the terraforming tools available.
4.While advancing to core, convert planets to T3, place colonies, upgrade planet defences to max so that GROX can not destroy it. There are tools that can defend any GROX attacks. Use them. Also make alot of allies.
5.GROX can be killed easily, just transform their planets to t1 and they will die(they can only live on t0 planets), no need to stabilize planets, just converting is good enough.
6.Use wormholes to jump through space, travel each wormhole both ways to show a travel path through it.
7.Make frequent saves so you can load up if anything goes out of order.