General Relativity

What struck me was some regularity in the anomaly. The rotational velocities were not just larger than expected, they became constant with radius. Why? Sure, if there was dark matter, the speed of stars would be greater, but the rotation curves...

Perhaps the most fundamental philosophical question that you can ask in science is: "Why are we here?"

To understand the universe, we have to bring together the two key ideas that are governing modern physics. On the one hand, we have Einstein’s...