The star Tau Ceti, about twelve light years away, has an abundance of cometary and asteroidal material in orbit around it.

Many hypotheses have been suggested to explain how asteroidal or cometary material got into the inner solar system, but no consensus yet exists.

Bring raw asteroidal material to Earth for use.

The uncut face of the asteroidal material was some thirty meters away.

There's a layer of dead clay that corresponds to that era, and we find asteroidal material in it.

"There's also a lot of asteroidal material in the system," he said.

I will construct a succession of large, permanently occupied space stations using asteroidal materials.

The one nearest the station is largely of natural ferrous compounds, prob- ability ninety-seven percent-plus semi-processed asteroidal material.

"The shell of asteroidal material seems to have accreted naturally."

Almost self-sufficient, with facilities for manufacturing their own fuel, parts, and weapons requirements from asteroidal material.