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Physical World

Fighting fire with fire ... and fauna

Climate change is aggravating the seasonal burns that Australia has always known. They won’t be snuffed out, but new ecological strategies may help.

When nuclear goes retro | Things to Know

VIDEO: Old becomes new as nuclear startups take another look at using liquid nuclear fuel as a safe alternative to conventional nuclear reactors

Physicists probe validity of Einstein’s gravity on cosmic scales

New tests could verify general theory of relativity, or find flaws

The iron ocean

Through dust, not rust, the metal plays a complex, controversial role in Earth’s climate

The tricky task of tallying carbon

To slow or stop global warming, the world agrees it must cut carbon dioxide emissions. But monitoring each nation’s output of greenhouse gases is not always straightforward.

The future that graphene built

Move over, flat carbon. Meet borophene, phosphorene and the rest of the next generation of “atomically thin” super-materials.

What are California megafires? | Things to Know

VIDEO: Megafires, which burn over 100,000 acres, can cause catastrophic damage. Researchers are studying fire behavior in the lab and in the field in order to fight these flames more effectively.

What are fire whirls? | Things to Know

VIDEO: Researchers examine the behavior of these tornado-like fire columns

Fast facts about the Milky Way | Things to Know

VIDEO: Our galaxy may seem humble, but here are a few things to know about what makes it an exceptional place

GPS is going places

Here are five things you didn’t know the navigation system could do

Lessons from scorching hot weirdo-planets

Hot Jupiters were the first kind of exoplanet found. A quarter-century later, they still perplex and captivate — and their origins hold lessons about planet formation in general.

Hotter than the sun: The mysterious solar corona

Several new missions aim squarely at a long-standing astronomical conundrum, with the promise of improving space-weather predictions

The next omics? Tracking a lifetime of exposures to better understand disease

Of the millions of substances people encounter daily, health researchers have focused on only a few hundred. Those in the emerging field of exposomics want to change that.

How gas fuels galaxies

VIDEO: Scientists track gas through time and space to better understand how conglomerations of stars are born and die

The life and breath of galaxies

Scientists track gas through time and space to better understand how conglomerations of stars are born and die

How the moon landings changed our view of the solar system

Lunar samples hinted at a barrage of debris pummelling planets billions of years ago. Fifty years after Apollo 11, that story is still unfolding. 

Plasmonics brings the molecular world into sharper focus

People have been using metals to manipulate light for centuries. Now researchers are using it to create powerful biosensors.

The mighty Milky Way

Our galaxy is far bigger, brighter and more massive than most others