"Look at the wall," Beta said.
There was a hole the size of a basketball in one side of the wall. The metal about it was melted, bulging out in a fringe around the hole and running down the wall to the floor. Alpha traced the probable trajectory of the missile which had made the hole and found another hole, much smaller, on the face of the vault. The walls of the vault were buckled slightly inward.
The two Tindars stared from one hold to the other in amazement. The Kantons came to their side.
"No meteor did that!" Miss Kanton's dupe said.
"It's hardly possible, unless ..." Beta paused. "Power was packed into it, whatever it was!"
"It penetrated three feet of tension steel at the very least," Alpha said. "Nothing as small as this meteor seems to me could have done that."
"Unless ..." Beta paused again. "The momentum is what counted. Suppose that the mass was terrific, the speed equally terrific?"
Alpha and Beta snapped their fingers at the same instant. "Neutronium!" they said.
"We've found several bits of it already in space," Alpha added. "Terrific mass. That's the only possible solution."