The kilogram is now based on energy changes in the quantum world rather than a physical object. Here's how that works. ...

Louisiana's Bonnet Carré Spillway diverts some of the Mississippi's floodwaters. But it also offers up a wealth of good physics questions. ...

The social network has a plan to merge the worlds of artificial intelligence and real-world machines, so that both may grow more powerful. ...

It's superfine. It's sharp. It sticks to everything. Before we return to the moon, we'll have to conquer one of the weirdest substances in the solar system. ...

NASA's Swamp Works may be humans' best hope for figuring out how to live and work on other planets. ...

There's a puzzling lack of planets slightly bigger than Earth, which is making astronomers rethink how planets form in the first place. ...

Levels of heat-trapping methane are rising faster than climate experts anticipated, triggering intense debate about why it's happening. ...

Brazil's agriculture minister will ask Chinese officials on Thursday to greenlight exports to the Asian nation of sugar made from genetically modified (GM) sugarcane, which is expected to be widely used in Brazil in coming years. ...

The Trump administration asked Congress on Monday to increase NASA spending next year by an extra $1.6 billion as a "down payment" to accommodate the accelerated goal of returning Americans to the surface of the moon by 2024. ...

The moon may be dynamic and tectonically active like Earth - not the inert world some scientists had believed it to be - based on a new analysis disclosed on Monday of quakes measured by seismometers in operation on the moon from 1969 and 1977. ...