We place a large asteroid directly in front of their ships, too close for them to maneuver away from.

Strange to see such small objects without a larger asteroid that gave birth to them.

A moment later the Orion suddenly appeared from behind the large asteroid in front of them.

"Drop a very large asteroid on top of your pretty planet."

Hard to starboard to avoid a large asteroid, the largest he'd seen yet.

There are not yet technologies to move a large asteroid and put it wherever we want.

There were actually two large condensed asteroids made at the same time.

More specifically, to a large asteroid at one edge of it.

"Or an extremely large asteroid, depending on the physical makeup of the body involved."

One was a large asteroid outside the system just beyond the sixteenth planet.