Divide any circle’s circumference by its diameter and you get pi. But what, exactly, are its digits? Measuring physical ...

The mystery of dark matter—unseen, pervasive, and essential in standard cosmology—has loomed over physics for decades. In new research, I explore a different possibility: Rather than postulating new ...

Zhejiang U., Inst. Mod. Phys. and Hangzhou, Zhejiang U. Cent. Opt. Electromagn. Res. A spin-connection gravitational gauge theory with a spin-affine connection as its fundamental dynamical variable is ...

As Russia rebuffs President Trump’s diplomatic push, President Volodymyr Zelensky of Ukraine plans to head again to the White House, this time seeking missiles. By Constant Méheut Reporting from Kyiv, ...

Since you’ve clicked on the heading of this article, you’ll probably have already worked out that the answer is, in fact, gravity. But, do you actually know what it is? Let’s address some of the most ...

There’s a big debate in cosmology about how fast the universe is currently expanding. The collision of two neutron stars in 2017, seen in an artist's rendering, created both gravitational waves and ...

Travel to another moon or planet and your weight will change — but not your mass. This is because your weight on other worlds depends on the gravitational force of attraction between you and that ...