People In A Hurry — Astrophysics For

Discovered much later, this mysterious force acts as a "cosmological constant" that is currently driving the universe's expansion to accelerate. The Cosmic Perspective

This invisible "frenemy" does not emit or reflect light but provides the gravitational glue that keeps galaxies from flying apart. It makes up roughly 85% of all matter. Astrophysics For People In A Hurry

Fourteen billion years ago, everything we’ve ever known—every star, planet, and person—was packed into a space smaller than the period at the end of this sentence. In an event known as the , this tiny, hot, and incredibly dense point began to rapidly expand. Discovered much later, this mysterious force acts as