Nuclear Winter On Mars

The Martian surface is covered with a thin layer of radioactive substances including uranium, thorium and radioactive potassium But why is there radioactive substaces on mars is it a proof of Nuclear Winter happened on Mars ? Earlier Dr. John Brandenburg, a senior propulsion scientist at Orbital Technologies Corp said that there was a natural nuclear blast on Mars. According to Brandenburg, the natural explosion, the equivalent of 1 million one-megaton hydrogen bombs, occurred in the northern Mare Acidalium region of Mars where there is a heavy concentration of radioactivity. But I the writer of this blog thinks that it is not natural it may have happened during a war between the Martians and the same once happened on Earth during the World War II Mare Acidalium as seen fro...