equivalence

One of the most basic assumptions of fundamental physics is that the different properties of mass -- weight, inertia and gravitation -- always remain the same in relation to each other. Without this equivalence, Einstein's theory of…

The hardest political stories for reporters to cover and pundits to analyze can be those that are neither 100 percent stories nor 50 percent stories.A 100 percent story is one in which reality is clear (even if partisans sometimes deny it):…

In new studies published in Physical Review Letters and a special issue of Classical and Quantum Gravity on September 14, a team of researchers present the most precise test yet of the Weak Equivalence Principle, a key component of the…