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Kepler's Third Law
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How to Weigh a Star Using a Moon How do astronomers weigh a star that's trillions of miles away and way too big to fit on a bathroom scale? In most cases they can't, although they can get a best estimate using computer models of stellar structure. New work by astrophysicist David Kipping says that in spec...
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Random matrix theory
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In 2002, Oak Ridge physicist Paul Koehler and his colleagues used the neutron beam to measure 'neutron resonances' in each of four different isotopes of platinum. The resonances are particular energies at which the neutrons are especially likely to be absorbed by the platinum nuclei. The motion o...
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Electron-Positron Pair Production
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Title: Electron-Positron Pair Production in Space- or Time-Dependent Electric Fields Authors: Hagen Kleinert, Remo Ruffini, She-Sheng Xue Treating the production of electron and positron pairs by a strong electric field from the vacuum as a quantum tunnelling process we derive, in semiclass...
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Physics Nobel Prize
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Three scientists who corralled light to transform our communications systems share this year's physics Nobel Prize. Read more
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Extended Red Emission
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Silicon Nanoparticles: Source of Extended Red Emission?
ADOLF N. WITT, Department of Physics and Astronomy, University of Toledo.
KARL D. GORDON, Department of Physics and Astronomy, Louisiana State University.
DOUGLAS G. FURTON, Department of Physical Sciences, Rhod...
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Silicon
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Researchers at the National Institute of Standards and Technology (NIST) have discovered a phenomenon long thought not to exist. They have demonstrated a mechanical fatigue process that eventually leads to cracks and breakdown in bulk silicon crystals. Silicon the backbone of the semiconduct...
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Vibration Energy Cell batteries
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A Japanese electronics firm has shown off a vibration-harvesting generator that could replace standard batteries. The Vibration Energy Cell batteries deliver power after a vigorous shake Brother Industries, better known for its line of printers, claims the devices could be used in place of AA o...
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Unification
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Title: Is There Unification in the 21st Century? Authors: Yuan K. Ha In the last 100 years, the most important equations in physics are Maxwell's equations for electrodynamics, Einstein's equation for gravity, Dirac's equation for the electron and Yang-Mills equation for elementary particles...
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Scientific discoveries
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If you look back on history, you get the sense that scientific discoveries used to be easy. Galileo rolled objects down slopes. Robert Hooke played with a spring to learn about elasticity; Isaac Newton poked around his own eye with a darning needle to understand colour perception. It took creativit...
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Protons
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The proton shrinks in size The proton seems to be 0.00000000000003 millimetres smaller than researchers previously thought, according to work published in today's issue of Nature. The difference is so infinitesimal that it might defy belief that anyone, even physicists, would care. But the new...
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Spin-statistics theorem
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Testing the Best-Yet Theory of Nature The best theory for explaining the subatomic world got its start in 1928 when theorist Paul Dirac combined quantum mechanics with special relativity to explain the behaviour of the electron. The result was relativistic quantum mechanics, which became a majo...
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Nuclear reactor
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Instructions on how to build a nuclear reactor have been revealed from five sealed envelopes that have lain hidden for almost 70 years. The documents were sent to the UK's Royal Society for safekeeping by James Chadwick, discoverer of the neutron, during the World War II. He felt their contents, whi...
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Dark Matter Time Projection Chamber
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The Dark Matter Time Projection Chamber (DMTPC) is a directional dark matter direct detection experiment. DMTPC uses a Time Projection Chamber filled with diffuse CF4 gas and an optical (CCD) readout to look for nuclear recoils from spin-dependent WIMP interactions. [url=http://en.wikipedi...
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Isotopes
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Title: Identification of 45 New Neutron-Rich Isotopes Produced by In-Flight Fission of a 238U Beam at 345 MeV/nucleon Authors: Tetsuya Ohnishi, Toshiyuki Kubo*, Kensuke Kusaka, Atsushi Yoshida, Koichi Yoshida, Masao Ohtake, Naoki Fukuda, Hiroyuki Takeda, Daisuke Kameda, Kanenobu Tanaka, N...
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Bubbles
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With the help of high speed video, scientists have discovered that there is far more to bursting bubbles than meets the eye. Under the right conditions, a bursting bubble on a liquid surface does not simply vanish, but creates a perfect ring of tiny "daughter bubbles". This occurs as the r...
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