Life arose again, and this time a rain of cometary debris scoured the world clean.

He writes that there is an "absence of copious cometary debris in the cores."

She threw it at a piece of cometary debris.

He believes that impacts from cometary debris may account for most of the downturns, especially the AD 540 event.

There was the contrail, bright and hot, arcing through splashed cometary debris.

Beyond were several icy dwarf planets and assorted cometary debris.

Computer models suggest that collisions of cometary debris during the formation period play a far greater role than was previously thought.

However, there would be occasional impacts from meteorites and cometary debris.

"Can we navigate safely through all that cometary debris?"

The little spaceship swam slowly among the crowded bits of cometary debris.