"Foundation and Earth" by Isaac Isimov

I finished reading Isaac Isimov's "Foundation and Earth"(1986) in Japanese. The fifth novel in Asimov's Foundation series. Councilman Golan Trevize goes in search of legendary Earth, all references to which have been erased from galactic libraries. Finally he found the Mother Earth and met 20,000 years old robot, Daneel Olivaw! Foundation series is a long story. Asimov wrote "The Caves of Steel"(1954) and Robot Daneel Olivaw appeared first time. Yes, Daneel was the real key person (robot) in Asimov's long novel of vast univers.