Physics

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Scientists challenge conventional wisdom to improve predictions of bootstrap current

This article describes a new finding about the composition of bootstrap current at the edge of fusion plasmas.

Why is space three-dimensional?

(Phys.org)—The question of why space is three-dimensional (3D) and not some other number of dimensions has puzzled philosophers and scientists since ancient Greece. Space-time overall is four-dimensional, or (3 + 1)-dimensional, where time is the fourth dimension. It's well-known that the time dimension is related to the second law of thermodynamics: time has one direction (forward) because entropy (a measure of disorder) never decreases in a closed system such as the universe.

NASA to Provide Coverage of May 9 Mercury Transit of the Sun

NASA is inviting media and viewers around the world to see a relatively rare celestial event, with coverage of the Monday, May 9 transit of the sun by the planet Mercury. Media may view the event at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Supercooled cavities for particle acceleration

When you think about the coldest places on Earth, the National Synchrotron Light Source II (NSLS-II), a U.S. Department of Energy (DOE) Office of Science User Facility located at the DOE's Brookhaven National Laboratory, probably doesn't come to mind. But accelerating electrons around the half-mile-long ring of NSLS-II at nearly the speed of light requires some extremely cold temperatures, hundreds of degrees below the freezing point of water.

Is it possible to cry a river?

With Tottenham's dreams of Premier League glory shattered before their very eyes by a 2-2 draw at Stamford Bridge, University of Leicester students research whether it is possible to really cry a river.

Quantum logical operations realized with single photons

Scientists take an important step towards a logical quantum gate for photons.

A new EU project on ultra-precise atomic clocks

Jan Thomsen, Associate Professor and head of the Ultracold Atoms research group at the Niels Bohr Institute is part of a grant of 14 million kroner to participate in an EU project to develop ultra-precise atomic clocks that will define international timescales.

An experiment seeks to make quantum physics visible to the naked eye

Predictions from quantum physics have been confirmed by countless experiments, but no one has yet detected the quantum physical effect of entanglement directly with the naked eye. This should now be possible thanks to an experiment proposed by theoretical physicists. The experiment might pave the way for new applications in quantum physics.

NASA Welcomes New Director for its Jet Propulsion Laboratory

The following is a statement from NASA Administrator Charles Bolden on the selection of Michael Watkins as the new director of the agency’s Jet Propulsion Laboratory (JPL) in Pasadena, California.

World's tiniest engine small enough to enter living cells

Researchers have built a nano-engine that could form the basis for future applications in nano-robotics, including robots small enough to enter living cells.

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