the nuclear meltdown at Chernobyl.
You probably mean at Chernobyl in the Ukraine, in 1986
The Ukraine
Chernobyl, Ukraine, in 1986, is probably what you are thinking of.
The disaster occurred on On 26 April 1986 at 01:23:40 a.m, in the then USSR, It is now located in Ukraine, a former soviet state.
The Columbia disaster occurred on February 1, 2003, the Challenger disaster occurred on January 28, 1986.
Chernobyl, Ukraine, 1986
The Space shuttle Challenger disaster occurred on January 28, 1986.
The space shuttle Challenger disaster occurred on January 28, at 11:39am
Nuclear power accidents are a disaster. The 1986 nuclear accident at the Chernobyl Nuclear Power Plant in Ukraine was a catastrophic accident.
The country that was affected most is Belarus, because it is the smallest country and 1 part of 3 is dead. Then goes Ukraine because it is bigger and it least effected. And then goes Russia because it is giant and affected least. Good luck!
The world's worst known nuclear disaster was at Chernobyl, in the Ukraine. The Chernobyl Disaster, as it is called, happened on April 26, 1986. There is a link to a Wikipedia article on this below.
Three mile Island near Harrisburg,PA March 28, 1979