For more than a century, physics has been built on two great theories. Einstein's general relativity explains gravity as the bending of space and time. Quantum mechanics governs the world of particles ...

How the Sun's energy gets to us How solar cells and solar panels work What energy solar cells and panels use What the advantage and disadvantages of solar energy are This resource is suitable for ...

Imagine a world where energy is no longer a finite resource—a world powered by a clean, virtually limitless source that doesn’t pollute the air or leave behind hazardous waste. It sounds like science ...

“Dark energy” is a term scientists use to refer to whatever is causing the universe to expand faster over time. We don’t know exactly what dark energy is—no one has ever directly seen or measured ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. For more than a century, physics has been built on ...

The universe may not only be geometry and energy—but also memory. And in that memory, every moment of cosmic history may still be written. For more than a century, physics has been built on two great ...