Stephen Baxter, Britain's foremost author of "hard" SF rooted in real physics, is renowned for thinking big. Time begins with a US entrepreneur's deceptively low-key plans to reclaim space and exploit the asteroids, bypassing NASA's bureaucracy and safety regulations. One bizarre cost-cutting measure: the "Big Dumb Booster" pilot is a genetically enhanced, intelligent squid. Then the mission is redirected following a weird mathematical prediction that humanity hasn't long to live, and a "Feynman radio" transmission from the future that highlights a particular asteroid. Here a space-time gateway opens on unimaginably distant futures, stepping far beyond the dying sun of Wells's The Time Machine to visions of a galaxy reshaped by humanity to hoard its energy ... beyond stars, beyond black holes, beyond even mass. And the emerging message, seen most clearly by a new generation of persecuted, ultra-gifted children, is that this seeming triumph--this total exploitation of our universe's possibilities--isn't good enough. A better path awaits, via a cataclysm that dwarfs mere supernova explosions... Baxter pays homage to the transformations of Clarke's Childhood's End (there's also a nod to 2001), but without the mysticism: it's all respectable, if speculative, physics. His final, devastating payoff makes sequels seem impossible. Two are planned. Rousing stuff, on a cosmic scale. --David Langford