A newly-discovered system containing a pulsar and its white-dwarf companion has put gravitational theories to the most extreme test yet. The two objects orbit each other once every two and a half hours. In such a system, the orbits decay and gravitational waves are emitted,...
Visiting Faculty Position - Amherst College Director of Mount Laguna Observatory (San Diego State University) Scientific Director -SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East) Staff Scientist -SLAC National Accelerator...
The x-ray contrast between a cancerous lesion and surrounding normal tissue can be enhanced by using an exogenous contrast agent. Existing small-molecule agents used for contrast-enhanced digital mammography (CEDM), however, have limited tumor specificity and a short effective...
Using a series of compressive shocks rather than a single shock, a team of researchers compressed iron up to 5.6 million atmospheres (5.6 million times the pressure at the Earth's surface), a record pressure for solid iron. Using multiple series of shocks keeps the entropy...
How long does it take to fall down a tunnel through the center of the Earth to the other side? A 1966 analysis published in the American Journal of Physics figured that it would take 42 minutes assuming a uniformly dense Earth. A paper recently posted on arXiv explores this...
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