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

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, good ol' Earth helps us understand what the universe might be doing beyond ...

New models explain how small black holes in the early universe beat the clock and grew into massive objects within millions ...

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 ...