Physics

Scientists report hint of dark matter in first results from $2 billion cosmic ray detector (Update 2)

A $2 billion cosmic ray detector on the International Space Station has found the first significant hint of dark matter, the mysterious substance that is believed to hold the cosmos together but has never been directly observed, scientists say.

'Dancing' silicon atoms discovered in graphene

Jumping silicon atoms are the stars of a newly discovered atomic scale ballet. The "dancing" movement of the silicon atoms was caused by the energy transferred to the material from the electron beam of the team's microscope.

Physicists decipher social cohesion issues

Migrations happen for a reason, not randomly. A new study, based on computer simulation, attempts to explain the effect of so-called directional migration – migration for a reason – on cooperative behaviours and social cohesion. These results appear in a study about to be published in European Physical Journal B by Hongyan Cheng from Beijing University of Posts and Telecommunications and colleagues.

New Technique May Help Find Galaxy's 100 Billion Earth-Like Planets

Finding Earth-like planets is hard. For years, astronomers searching for worlds beyond our solar system found mostly gas giants like Jupiter, since those are bigger and easier to detect, even though smaller planets might actually be more common. But a paper in the Monthly Notices of the Royal Astronomical Society suggests a new way of looking for exoplanets may help find the estimated 100 billion Earth-like planets in the Milky Way.

The new technique, which is actually just an improvement

Search for dark matter: Experiment measures antimatter excess in cosmic ray flux

The international team running the Alpha Magnetic Spectrometer (AMS) today announced the first results in its search for dark matter. They report the observation of an excess of positrons in the cosmic ray flux. The results are consistent with the positrons originating from the annihilation of dark matter particles in space, but not yet sufficiently conclusive to rule out other explanations.

Building quantum states with individual silicon atoms

By introducing individual silicon atom 'defects' using a scanning tunneling microscope, scientists have coupled single atoms to form quantum states.

Sonic lasso catches cells

(Phys.org) —Academics have demonstrated for the first time that a "sonic lasso" can be used to grip microscopic objects, such as cells, and move them about.

Light tsunami in a superconductor

Superconductors are materials which conduct electric currents without any resistance. Scientists have managed to selectively influence this resistance-free conductivity with a powerful terahertz laser. This very precise laser light turns into a vortex which moves through the superconductor like a tsunami.

Quantum cryptography: On wings of light

Physicists have, for the first time, successfully transmitted a secure quantum code through the atmosphere from an aircraft to a ground station.

NASA Invests in Small Business Innovative Research and Technology Proposals to Enable Future Missions

NASA has selected 295 research and technology proposals from 216 American small businesses for negotiations that may lead to contract awards worth a combined $38.7 million.

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