spherule

They were looking for spherule particles, or tiny fragments of rock, left behind by impact.

We found that the spherules along the meteor path have an unusual composition that suggests that they came from outside the solar system.

Loeb says additional evidence comes from the trajectory of IM1 as it passed through the atmosphere and broke apart before entering the ocean as spherules.

Even if the spherules hit the ocean where Loeb says, they would have likely drifted by tens of kilometers in ocean currents before settling on the seabed, Desch argues.

At the expedition’s conclusion, our final count was a whopping 50 spherules, ranging in size at 100–700 microns, with the plurality coming from the search strip I calculated.