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Climate

Satellite space junk might wreak havoc on the stratosphere

Hundreds of defunct satellites plunge toward Earth every year. Scientists are studying how the chemical stew left in their wake impacts the atmosphere.

Health & Medicine

Scientists identify a long-sought by-product of some drinking water treatments

Chlorine-based water treatments create many by-products, but one has been elusive. Its identification sets the stage for studying its health effects.

Animals

For adult chimps, playing may be more important than previously thought

A multiyear study of dozens of wild, adult chimps suggests that play helps reduce tension and boost cooperation among individuals.

Astronomy

This is the first close-up image of a star beyond our galaxy

The first-ever close-up of an extragalactic star looks different than expected and might give a view of what stars look like at the end of their lives.