billion years old
- ancientVery old indeed
- cosmicPertaining to the universe
- eonsImmense spans of time
- geologicalOf Earth's physical structure
- PrecambrianEarliest geological eon
fossils · universe · stars · formation · Earth · crust · deep · time · ageless · unfathomable · rocks · meteorite · solar · system · origin · stardust · radioactive · dating
cosmic/geological timescale
billion years oldprimordial
Existing from the start
forming · emerging · instantaneous · stellar nursery · first generation
permanence and endurance
billion years oldephemeral
Lasting very briefly
fleeting · momentary · transient · instantaneous · short-lived