Add Yahoo as a preferred source to see more of our stories on Google. Dark energy is one of the greatest mysteries of the universe. This mysterious force is thought to be accelerating the expansion of ...

The universe is expanding and that expansion is accelerating under the power of dark energy and eventually all matter and energy will be dispersed over such unthinkable distances that nothing can stop ...

This graphic offers a glimpse of the history of the Universe, as we currently understand it. The cosmos began expanding with the Big Bang but then around 10 billion years later it strangely began to ...