Galaxy's End (1988) by Richard A Lupoff

TECHNOLOGY'S GREATEST TRIUMPH. HUMANKIND'S LAST HOPE...

Daniel Kitajima was a creature of mind and machine. His artificial limbs were endowed with super-human strength, his perceptual abilities enhanced with telescopic vision, radar and infrared. With proper care, he would live forever - except for one grim inevitable fact...

The Solar System itself was about to be destroyed. The sun was heating up, scorching Earth's deserts and transforming its polar icefields into quagmires. The entire galaxy was in danger. And nothing human could halt the oncoming disaster.

But Daniel Kitajima was not exactly human...

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