Cetis Gamma might, he considered, be in the process of becoming a nova. Certainly beyond the horizon there was even more terrible heat than had struck the human colony before sundown. Even if the sun did not explode, even if it was only as fiercely blazing as at its setting, they would die within hours after sunrise. If it increased in brightness, by daybreak its first rays would be death itself. When dawn came, the very first direct beams would set the shiver trees alight on the hilltops, and as it rose the fires would go down into the valleys. This house would smoke and writhe and melt; the air would become flame, and the planet's surface would glow red-hot as it turned into the sunshine. * * * * * "It's going to be--all right, Lon," Cathy said unconvincedly. "It's just something happening that'll be over in a little while. But--in case it isn't--we might as well be together. Don't you think so?" Lon put his arm comfortingly around her. He felt a very strong impulse to lie. He could pretend to vast wisdom and tell her the sun's behavior was this or that, and never lasted more than a few hours, but she'd know he lied. They could spend their last hours trying to deceive each other out of pure affection. But they'd know it was deceit. "D-don't you think so?" insisted Cathy faintly. He said gently, "No, Cathy, and neither do you. This is the finish. It would've been a lot nicer to go on living, the two of us. We'd have had long, long years to be together. We'd have had kids, and they'd have grown up, and we'd have had--a lot of things. But now I'm afraid we won't." He tried to smile at her, but it hurt. He thought passionately that he would gladly submit himself to be burned in the slowest and most excruciating manner if only she could be saved from it. But he couldn't do anything. Cathy gulped. "I-I'm afraid so, too, Lon," she said in a small voice. "But it's nice we met each other, anyhow. Now we know we love each other. I don't like the idea of dying, but I'm glad we knew we loved each other before it happened." Lon's hands clenched fiercely. Then the rage went away. He said almost humorously, "Carson--he's back in Cetopolis. I wonder how he feels. He has no better chance than anybody else. Maybe he's sent off spacegrams, but no ship could possibly get here in time." Cathy shivered a little. "Let's not think about him. Just about us. We haven't much time." And just then, very strangely, an idea came to Lon Simpson. He tensed. After a moment, he said in a very queer voice, "This isn't a nova. It's a flare-up. The sun isn't exploding. It's just too hot, too big for the temperature inside it, and it's a closed system. So radiation pressure has been building up. Now it's got to be released. So it will spout geysers of its own substance. They'll go out over hundreds of thousands of miles. But in a couple of weeks it will be back--nearly--to normal."