The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The accident that resulted in a commercial airplane crashing into the Potomac yesterday will require air safety investigators ...

Polio, a disease that can cause lifelong paralysis, has been eliminated from the U.S. Experts fear a resurgence if lifesaving ...

Katherine Laliotis is a freelance science writer and Ph.D. candidate in astrophysics. She often covers stories at the intersection of science and society.

Observatories in Chile’s Atacama Desert, including the world’s largest optical telescope, could be blinded by light pollution ...

These caterpillars carry a toxic chemical cocktail and Inquisition-like delivery implements— and their geographic range is ...