the Tsar Bomba, only had the force of around 50 megatons of TNT. That is not to say it would be the most catastrophic impact the planet has ever had. It is estimated that an asteroid around the ...

while a 90-metre asteroid exceeds 50 megatons – roughly equivalent to the Tsar Bomba, the most powerful nuclear device ever detonated," warned Dr O’Donoghue. Based on current estimations of ...