The Universe is expanding, and individual, bound structures are all receding away from one another. How, then, are galaxies still colliding?

“Asking the question of, where did the entire universe come from, is no longer a question for poets and theologians and philosophers. This is a question for scientists, and we have some amazing scientific answers to this question that have defied even the wildest of our expectations.”

From the tiniest subatomic scales to the grandest cosmic structures of all, everything that exists depends on two things: charge and mass.

When we divide matter into its fundamental, indivisible components, are those particles truly point-like, or is there a finite minimum size?

Here in our Universe, stars shine brightly, providing light and heat to planets, moons, and more. But some objects get even hotter, by far.