In Arizona, nature is diverse and dramatic. The state's Tonto Natural Bridge State Park is home to the world's largest natural travertine bridge, where visitors can hike and explore its unparalleled ...

ORACLE, Ariz. — Plopped in the Sonoran Desert, just outside Tucson, Ariz., sits a massive, multilevel greenhouse that's probably best known as the inspiration for a Pauly Shore movie. A slick, stepped ...

The Biosphere 2 facility, specifically its Landscape Evolution Observatory (LEO), serves as a research platform to investigate how life transforms landscapes, ranging from local environments to ...

ORACLE, AZ — Arizona is home to one of the most unique science experiments in the world. Biosphere 2 is a groundbreaking research facility studying climate change and ecosystems inside an enclosed ...

NASA’s Earth Observing System provides nearly 30 years of continuous, high-quality measurements of Earth’s land, oceans, atmosphere, and ice, supporting climate research and long-term environmental ...

On Sept. 26, 1991, a grand experiment began. Eight people were locked in the giant terrarium, Biosphere II, to live without physical contact with the outside world for two years. Biosphere II was a ...

Earth's rotation is randomly speeding up, and nobody is quite sure why. These speedups, which have occurred several times over the last few years, haven't had any effect on daily life, but they also ...

Tiny bits of Earth’s atmosphere have been drifting to the moon for billions of years, guided by Earth’s magnetic field.