Cosmology
What Is the Big Bang, and What Does It Explain?
The Big Bang is the leading explanation for how everything began, yet it is one of the most misunderstood ideas in science. It was not an explosion in empty space. Here is what the Big Bang actually is, and the evidence that supports it.
What Is Dark Matter, and Why Can’t We See It?
Most of the matter in the universe is invisible. We cannot see it, touch it, or make it in a lab, yet without it galaxies would fly apart. Here is what dark matter is.