The universe is not just expanding; it’s accelerating. When cosmologists first realized this in 1998, it was alarming. The attractive gravitational pull of matter should cause the…

Particle physicists had two nightmares before the Higgs particle was discovered in 2012. The first was that the Large Hadron Collider (LHC) particle accelerator would see precisely…

How about that! Mr. Galileo was correct in his findings.” That conclusion wasn’t based on the most careful experiment you’ll ever see, but it was one of the most spectacular…

My aim as a theoretical physicist is to unite quantum theory with Einstein’s Theory of General Relativity. While there are a few proposals for this unification, such as string theory…

In the mid-1990s, I studied mathematics. I wasn’t really sure just what I wanted to do with my life, but I was awed by the power of mathematics to describe the natural world. After…

The name of the image—the “Flammarion engraving”—may not ring a bell, but you’ve seen it many times. It depicts a traveler wearing a cloak and clutching a walking-stick;…

Before there is life, there must be structure. Our universe synthesized atomic nuclei early in its history. Those nuclei ensnared electrons to form atoms. Those atoms agglomerated…

How do you feel about the multiverse?” The question was not out of place in our impromptu dinner-table lecture, yet it caught me completely off-guard. It’s not that I’ve never…

Experimentalists are the cowboys of physics,” says Melissa Franklin, an experimental particle physicist at Harvard University. They have to be able to tell theorists, “I don’t…

When they met, Einstein wasn’t Einstein yet. He was just Albert Einstein, a kid, about 17, with a dark cloud of teenage angst and a violin. Michele Besso was older, 23, but a kindred…