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Kilogram Redefined. The Metric System Overhaul Is Complete

On the morning of Friday, November 16, scientists and diplomats crammed into an auditorium in Versailles, a stone’s throw from the Sun King’s gilded chateau. Patrick Abbott, an American physicist, had flown into France for the long weekend. Forehead gleaming and blue suit jacket draped across his lap, Abbott watched ...

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Citizen scientists discover five-planet system

In its search for exoplanets — planets outside of our solar system — NASA’s Kepler telescope trails behind Earth, measuring the brightness of stars that may potentially host planets. The instrument identifies potential planets around other stars by looking for dips in the brightness of the stars that occur when ...

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Another close-by planetary system?

The ALMA Observatory in Chile has detected dust around the closest star to the Solar System, Proxima Centauri. These new observations reveal the glow coming from cold dust in a region between one to four times as far from Proxima Centauri as the Earth is from the Sun. The data ...

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Saudi Crown Prince’s Mass Purge Upends a Longstanding System

LONDON — A midnight blitz of arrests ordered by the crown prince of Saudi Arabia over the weekend has ensnared dozens of its most influential figures, including 11 of his royal cousins, in what by Sunday appeared to be the most sweeping transformation in the kingdom’s governance for more than ...

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The United States Needs an Earthquake Warning System Already

On Monday night, residents of the Los Angeles neighborhoods of Westwood, Los Feliz, Silver Lake, and parts of the San Fernando Valley experienced a mild earthquake—a magnitude 3.6. Most people slept through the temblor and no damage was reported. But a select group of 150 LA residents got a text ...

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Molecular system for artificial photosynthesis

Photosynthesis in green plants converts solar energy to stored chemical energy by transforming atmospheric carbon dioxide and water into sugar molecules that fuel plant growth. Scientists have been trying to artificially replicate this energy conversion process, with the objective of producing environmentally friendly and sustainable fuels, such as hydrogen and ...

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Solar system: New insights into ring system

A team of researchers in Japan modeled the two rings around Chariklo, the smallest body in the Solar System known to have rings. This is the first time an entire ring system has been simulated using realistic sizes for the ring particles while also taking into account collisions and gravitational ...

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