It had an explosive power of 10 megatons. The US hydrogen bomb explosion in 1952 Archive news footage of the blast shows observers watching from military boats about 50km away. Harold Agnew ...

The hydrogen bomb, which carried the force of 50 million tons of conventional explosives, was detonated in a test in October 1961. The footage shows an immense fireball and a 60-km high mushroom ...

footage of history’s most powerful nuclear weapon was kept top-secret. Now, Russia is offering a behind-the-scenes look at the moments leading up to the detonation of that hydrogen bomb ...

Why it's so special: Not all stars in the night sky are what they seem. Take R Aquarii, a point of light roughly between where Saturn and Jupiter appear in the sky right now. It's two stars, not one.

A nebula with rainbow swirls that make a plus-sign shape That hydrogen-bomb-like event is called a nova. A similar event likely created the colorful nebula, called Cederblad 211, around R Aquarii ...