But not when your expectations have been raised to extinction-event-size asteroid objects.

WSJ: At the Intersection of Yoko and Idaho

"Today's event is a strong reminder of why we need continuous efforts to survey and identify near-Earth objects, " said Thomas Reiter, European Space Agency's Director of Human Spaceflight and Operations.

CNN: STORY HIGHLIGHTS

The event will be the first about Pompeii and Herculaneum in London for 40 years and will bring together recently discovered objects and finds from earlier excavations, many of which have never been seen outside Italy.

BBC: British Museum to exhibit artefacts from buried cities