<human>:  Where was the Chernobyl disaster?
<bot>: The Chernobyl nuclear power plant was located in the city of Pripyat, Ukraine. It was built in the 1970s and was the largest nuclear power plant in the world at the time of the disaster. The Chernobyl disaster occurred on April 26, 1986, when a reactor exploded at the plant. The explosion released a large amount of radiation into the atmosphere, which spread over much of Europe. The explosion was so powerful that it was visible from space.