Betelgeuse Supernova And Its Impact On Earth – Science Documentary

Were a supernova to go off within about 30 light-years of us, that would lead to major effects on the Earth, possibly mass extinctions. X-rays and more energetic gamma-rays from the supernova could destroy the ozone layer that protects us from solar ultraviolet rays.

What Would a Hydrogen Bomb Do to the Pacific Ocean? 

The latest fiery exchange between the United States and North Korea has produced a new kind of threat. On Tuesday, during his speech at the United Nations, President Trump said his government would “totally destroy North Korea” if necessary to defend the United States or its allies. On Friday, Kim Jong Un responded, saying North Korea “will consider with seriousness exercising of a corresponding, highest level of hard-line countermeasure in history.”

The North Korean leader didn’t elaborate on the nature of this…