Physics

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human-made particle

AGAINST THE FLOW  In a new experiment, micrometer-sized particles sensed their direction and propelled themselves upstream. Each particle (one shown in this micrograph) was made of a plastic sphere engulfing a hematite cube (colored red). 

A 60-minute exposure of Mount Teide in the Canary Islands

AS THE WORLD TURNS  A 60-minute exposure of Mount Teide in the Canary Islands shows star trails, a product of Earth’s spin. Tiny deviations in Earth’s rotation rate could account for difficulties in measuring Newton’s gravitational constant, a new study suggests.

strontium atomic clock

RIGHT ON TIME  A new atomic clock contains two ultrasensitive thermometers (center) that enable scientists to account for heat-caused fluctuations that limit the clock’s precision.

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