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336 pages, Mass Market Paperback
First published January 1, 2001
Apparently, time travel is the most dangerous thing an intelligent race can discover, because a civilization capablke of exploring its own history is likewise capable of changing it. When that happens, more often than not they destroy themselves . . . and sometimes they take other races with them.
Oberon's AI discovered a quantum irregularity in Earth's gravity well; exotic matter contained within the pods beneath the saucer enlarged the subatomic rift into a funnel large enough for the timeship to pass through, and laced the funnel's mouth with energy fields that would keep the wormhole temporarily stable. Within moments, a small area of spacetime was warped into something that resembled a four-dimensional ram's horn: a closed time-like circle. Relentlessly attracted by the wormhole it had just created, the timeship plummeted into the closed-time circle.