“Wish you’d give me an orbit on this thing, Joyce,” he said, “so I could lock onto it.”

“It ain’t got no orbit, man,” Joyce said. “I’m trackin’ it, but I don’t understand it. That rock is on a closing curve with us, and slowin’ down fast.”

“What’s the velocity, Joyce?” I asked.

“Averagin’ about 1,000 relative, Captain, but slowin’ fast.”

“All right, we’ll hold our course,” I said.

I keyed for a general announcement.

“This is the Captain,” I said. “General Quarters. Man action stations and prepare for possible contact within one hour.”

“Missile Section. Arm No. 1 Battery and stand by.”

Then I added, “We don’t know what we’ve got here, but it’s not a natural body. Could be anything from a torpedo on up.”

I went back to the Beam screen. The image was clear, but without detail. The two discs slowly drew apart, then closed again.