Kingston grunted sourly at the visi-plate and pointed out a faint arc at one edge. "What's that?" he asked. "Do we need a new tube at this crucial moment?"
"No."
"Then what is it?"
Maddox turned the dials a bit and the arc came out of the frame clearly enough to display a disc. Faint, unreadable, but none the less a definite pattern.
Maddox looked at it carefully and then retreated the plane of view to many thousands of miles into deep space. Right out to the limit of his range he went.
And there were three discs, all of a size. One was, of course, the flaming Earth Two.
"We're approaching!" yelled Kingston. "Those other discs are Earth One and Three."
"But—"
"When their energy levels approach one another it will be unnecessary to employ a depth of penetration correction!" snapped Kingston. "For they'll all be on the same level."