"All I'm afraid of," he said, "is that he'll get too close to that sun before we catch up with him. If he gets close enough so he can fill those accumulators, he'll pack a bigger wallop than we do. It'll all be in one bolt, of course, for his power isn't continuous like ours. He has to collect it slowly. But when he's really loaded, he can give us aces and still win. I'd hate to take everything he could pack into those accumulators." Greg shuddered. "So would I." The _Invincible_ was exceeding the speed of light, was enveloped in the mysterious darkness that characterized the speed. They could see nothing outside the ship, for there was nothing to see. But the tiny mechanical shadow, occupying a place of honor on the navigation board, kept them informed of the position and the distance of the _Interplanetarian_. Greg lolled in his chair, watching Russ. "I don't think we need to worry about him throwing the entire load of the accumulators at us," he said. "He wouldn't dare load those accumulators to peak capacity. He's got to leave enough carrying capacity in the cells to handle any jolts we send him and he knows we can send him plenty. He has to keep that handling margin at all times, over and above what he takes in for power, because his absorption screen is also a defensive screen. And he has to use some power to keep our television apparatus out." Russ chuckled. "I suppose, at that, we have him plenty worried." The thunder of the engines filled the control room. For days now that thunder had been in their ears. They had grown accustomed to it, now hardly noticed it. Ten mighty engines, driving the _Invincible_ at a pace no other ship had ever obtained, except, possibly, the _Interplanetarian_, although lack of power should have held Craven's ship down to a lower speed. Craven wouldn't have dared to build up the acceleration they had now attained, for he would have drained his banks and been unable to charge them again. "Maybe he won't fight," said Russ. "Maybe he's figured out by this time that he's heading for the wrong star. He may be glad to see us and follow us back to the Solar System." "No chance of that. Craven and Chambers won't pass up a chance for a fight. They'll give us a few wallops if only for the appearance of things." "We're crawling up all the time," said Russ. "If we can catch him within four or five billion miles of the star, he won't be too tough to handle. Be getting plenty of radiations even then, but not quite as much as he would like to have." "He'll have to start decelerating pretty soon," Greg declared. "He can't run the chance of smashing into the planetary system at the speed he's going. He won't want to waste too much power using his field as a brake, because he must know by this time that we're after him and he'll want what power he has to throw at us." Hours passed. The _Invincible_ crept nearer and nearer, suddenly seemed to leap ahead as the _Interplanetarian_ began deceleration.