Merging With Other Series
Asimov later integrated the Robot Series into his all-engulfing Foundation series, making R. Daneel Olivaw appear again twenty thousand years later in the age of the Galactic Empire, in sequels and prequels to the original Foundation trilogy; and in the final book of the Robots series — Robots and Empire — we learn how the worlds that later formed the Empire were settled, and how Earth became radioactive (which was first mentioned in Pebble in the Sky).
The Stars, Like Dust states explicitly that the Earth is radioactive because of a nuclear war. Asimov later explained that the in-universe reason for this perception was that it was formulated by Earthmen many centuries after the event, and which had become distorted, due to the loss of much of their planetary history. This work is generally regarded as part of the Empire series, but does not directly mention either Trantor or the Spacer worlds. Based on details from the novel, such as Earth still being mostly habitable and the absence of a unified galactic government, it probably would fall during the early formation of the Empire (before it expanded to encompass the galaxy).
Read more about this topic: Robot Series (Asimov)
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