NOTE: The use of the word "After" in the first panel suggests an immediate causality which would have been of great credit to Earth's sophonts had things actually gone down that way. In 1980 CE a multi-disciplinary team led by physicist Luis Alvarez identified meteoric impact as the source of the iridium at the K-T boundary in Earth's fossil record, but it took several decades for Earthlings to get around to properly sweeping up the sorts of things that could lay down funereal iridium in the future.
Fortunately for the deoxyribonucleic acid family of sapient, self-replicating molecular megastructures, they got around to it in time.
NARRATOR: Dom Atlantis, the lecture continues...
PETEY: After the Alvarez team figured out what killed the dinosaurs, you began taking steps to prevent rocks from falling on your heads.
BREYA: Time is money. Make your point.
PETEY: I've been researching the end-states of galactic civilizations.
Metaphorically speaking, I'm looking for falling rocks.
BREYA: You think a rock is coming.
PETEY: You're holding this meeting ON the rock.
PETEY: Or maybe the meeting is the rock.
PETEY: I'm not sure yet.
Metaphors are complicated.
BREYA: Let us know when this one enters a stable orbit.