There is. When spending fuel to travel closer the the Federation base you have a small chance to arrive in an "ancient sector". This sector hast the same chance to appear as Rock Homewolds, but the way sector jumps work in infinite holds the added difficulty that you most of the time can't choose the sector you are jumping to. Therefore finding this sector is pretty unlikely. If you have a crystel crewmen when arriving in the sector you get a chance to explore it, allowing to unlock the crystal crewser. Without a crystal crewmen you are forced back into deepspace.