And empty space continued to expand ... it's the image of a time when everything in the universe was on fire. It's called the Cosmic Microwave Background, or CMB. It formed when protons and ...

From the very beginning of the Space Age, the United Nations recognized that outer space added a new dimension to humanity's existence. The United Nations family strives continuously to utilize ...

Cosmic rays are particles from outer space that travel across the universe. They can be made by the sun ... Some do reach the ground, but they’re generally no worse than any other background radiation ...