Add Yahoo as a preferred source to see more of our stories on Google. No one knows what kicked off the Big Bang that eventually allowed the stars to begin forming. Adolf Schaller for STScI, CC BY How ...

This video explains how scientists estimate the size of the observable universe and what we mean by its “radius,” using clear ...

The universe will not last forever. In fact, scientists have revealed that its lifespan is almost half over already. A team from the US and China have discovered that our universe will reach its ...