আইজাক আসিমভের রচিত প্রথম উপন্যাসের নাম কী ?
The series is set in the same universe as Asimov's first published novel, "Pebble in the Sky", although "Foundation" takes place about 10,000 years later. "Pebble in the Sky" became the basis for the "Empire" series. Then, at some unknown date (prior to writing "Foundation's Edge") Asimov decided to merge the "Foundation"/"Empire" series with his "Robot" series. Thus, all three series are set in the same universe, giving them a combined length of 15 novels, and a total of about 1,500,000 words (see the List of books below). The merge also created a time-span of the series of around 20,000 years.
Pebble in the Sky