aeons ago

Astronomers think the blast originated aeons ago from a supermassive black hole in the cluster.

Once, aeons ago, the Appalachians were of a scale and majesty to rival the Himalayas—piercing, snow-peaked, pushing breathtakingly through the clouds to heights of four miles or more.

Earth has been threatened repeatedly in Steven Universe, but it’s usually been more of a passive, existential threat, with the understanding that aliens who live on a much longer timeline were eventually going to get around to finishing the destructive planet-mining they began aeons ago.

Miss Throckmorton taught us that aeons ago.

Any sample that existed naturally when Earth formed would have decayed aeons ago.