As the only alkaline gas in the atmosphere, ammonia can react with sulfur dioxide and nitrogen oxides to form secondary fine particles, accelerating the generation of atmospheric haze.

NASA’s Terra satellite passed over the Southern Pacific Ocean and captured a visible image of extra-tropical cyclone Harold.

In a new study, published in the journal Nature, Michigan State University scientists show how plant genes select which microbes get to live inside their leaves in order to stay healthy.

Abnormal levels of stress hormones such as adrenaline and cortisol are linked to a variety of mental health disorders, including depression and posttraumatic stress disorder (PTSD).

The rich mosaic of reeds, ponds, and meadows of the Ili River Delta offer habitat for hundreds of species.

Over the past several weeks, NASA satellite measurements have revealed significant reductions in air pollution over the major metropolitan areas of the Northeast United States.

NASA invites video gamers and citizen scientists to embark on virtual ocean research expeditions to help map coral reefs around the world in an effort to better understand these threatened ecosystems.

Mapping the closest frontier, our oceans.

How can data from outer space be used to impact human health?

Many cancers can be successfully treated, but treatment itself often comes with risks as well.