*spoiler* That tip with starhammer memorial was amazing. Since I had a good mothership I managed to easily and continuosly kill waves of aliens that were spawning and gained 2000 exp points for each of the characters. But the memorial is not the only secret in the system. Right in the middle of the sector at the border of dust field there is a ship hull that will drop an artifact. It doesnt have a value or any use but if you want to see what message did game creators leave on it in a form of poem you might wanna check it out since you will have to go to the middle of the sector at some point any ways.
*spoiler*