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- ↑ In The Stars, Like Dust, interstellar travel is described as operating in noticeable but instantaneous jumps.
- ↑ Large areas of Earth are radioactive, apparently due to widespread use of nuclear weapons.
- ↑ The Empire novels are set during the time of the Empire of Trantor
- ↑ Pebble in the Sky begins with Joseph Schwartz being transported from present-day Chicago far into the future.