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Two "superpuff" planets orbiting a sunlike star over 1,000 light-years from Earth are as big as Jupiter and as dense as cotton candy.

New Horizons data reveal Pluto's first six confirmed landslides along steep crater rims.

Proposed federal rules would rely on political appointees to decide how a lot of U.S. science gets done. History shows the consequences of such actions.

In her new book, science journalist Roberta Kwok takes readers behind the scenes to understand how researchers get nature to give up its secrets.

A boost to heat production and drawing in more oxygen may help Andean leaf-eared mice thrive at altitude.

The HER Salt Lake Contraceptive Initiative's approach, which centered the user and made refills easy, meant all types of methods worked well.

Two studies of Neandertal remains suggest their newborns were about the same size as those of modern humans but developed faster through infancy.

Marine cloud brightening could cool part of the Pacific and weaken extreme El Niños, simulations suggest. But the approach could have risks.

There's never been a good method to check for violations of the Outer Space Treaty's prohibition of nuclear weapons in space.

The gold standard of scientific review, peer review by researchers' colleagues, is in crisis. AI might offer a solution but has problems of its own.