Quantum theory and Einstein's theory of general relativity are two of the greatest successes in modern physics. Each works ...

For more than a century, gravity has been the stubborn outlier in physics, resisting every attempt to merge Einstein’s smooth space-time with the jittery world of quantum mechanics. A new wave of ...

The lunar near side with its dark regions, or “mare,” covered by titanium-rich volcanic flows (center) makes up the moon’s familiar sight from Earth (left). The mare region is surrounded by a ...