Extragalactic origin confirmed

Cosmic rays — fast-moving, high-energy nuclei — pervade the Universe. We know that the lower-energy variety that we detect on Earth is funnelled by the solar wind. However, higher-energy cosmic […]

Martian dust blower

by Bart Verberck, Nature Physics 13, 623 (2017) doi:10.1038/nphys4207 (sci-hub) Your Earthly carpet sweeper won’t do the job in the low-pressure, CO2-dominant atmosphere on Mars. But Catalin Ticoş and colleagues […]

Ticking clocks

by Iulia Georgescu, Nature Physics 13, 529 (2017) doi:10.1038/nphys4169 (sci-hub) Special relativity assumes that laws of physics are the same in all reference frames, a principle known as Lorentz invariance. […]

Transparent perfect mirror

by Rachel Won, Nature Photonics 11, 331 (2017) doi:10.1038/nphoton.2017.90 (sci-hub – paper) Transparent ‘perfect’ mirrors — one-way mirrors that transmit or reflect light completely depending on the direction of view […]