Advancement should be made continuously... An ever-increasing horizon of ongoing optimistic future.
An important consideration about this is that progress is to be advancing in many different ways at the same time. Technological and scientific, obviously. But also cultural, there being an increase in the richness, diversity, and thoughtfulness of the sociologicals. Exploration being continuous too, there being many advancing frontiers (space being included!).
ETHICS are often (though not always) counterproductive, are usually based on outdated thinking, and serve only to temporarily delay progress.