“Scientists have long observed that the capability for a material to absorb electromagnetic radiation — a wave of energy in the form of sunlight and X-rays, among others — at a given wavelength and ...

The first semester of an undergraduate physics course invariably spends a lot of time on two big ideas: The momentum principle and the work energy principle. Both deal with forces acting on an ...

Low-energy experimental physics, on the other hand-- work in Atomic, Molecular, and Optical (AMO), or "Condensed Matter" (CM, the study of solids and liquids) physics, among others-- is much more ...

According to quantum physics, energy can be 'borrowed' -- at least for some time. Energies lower than zero are possible, much like a bank account that can be overdrawn. There are, however, certain ...

Astronomy Unknown physics may help dark energy act as 'antigravity' throughout the universe. Astronomy A 'cosmic car radio' could help scientists tune in to dark matter within the next 15 years.

Having taught classical mechanics to advanced undergraduates in physics, I find this to be true. The following figure, which I've taken from chapter VI, sec. 37 of the Mechanics by Landau and ...

The committee, formally known as the Particle Physics Project Prioritization Panel, or P5, was tasked by the U.S. Department of Energy and the National Science Foundation to lay out a road map for ...

Astronomers have spotted the highest-energy outburst of light from a pulsar ever seen. The discovery could indicate new physics around these incredibly dense, rapidly spinning dead stars.

Dark energy may have a completely unknown aspect of physics acting as an accomplice in its efforts to defy gravity, suppressing the growth of large-scale structures like galaxy superclusters.