What is dark energy?
Dark energy is driving the accelerating expansion of the universe, but its nature remains a complete mystery. Here's what you need to know about dark energy.
Dark energy is driving the accelerating expansion of the universe, but its nature remains a complete mystery. Here's what you need to know about dark energy.
The universe is a strange place: only 5% of the mass of everything that exists is ordinary matter. The rest is 25% dark matter and 70% dark energy.