Earth researchers have spent generations decoding the Grand Canyon, turning its cliffs and chasms into one of the clearest ...

A 2023 astronaut photo shows three dark hills, or mesas, towering above part of the Sahara desert in southern Mauritania. The ...

Arizona Cold Moon supermoon gives the desert a front row seat to 2025’s final full Moon. Here’s why it matters and how to watch it.

I pedaled through the drizzle to a ridgeline view of traffic on Interstate 10, then descended through the “snake tunnel” ...

Nestled in Arizona’s verdant Verde Valley, Clarkdale sits at that perfect sweet spot – close enough to bigger cities when you need them, but far enough away to maintain its small-town charm and, ...

Tucked between Sedona’s tourist-packed vortexes and Jerome’s ghost-hunting hotspots lies Cottonwood, Arizona. A place where your Social Security check might actually cover more than just your monthly ...

A migration corridor that allows jaguars and ocelots to cross into the U.S. is the latest border wall construction zone.

Scientists warn of tipping points as temperatures push past safe limits, but leaders stress action could still bring the planet back under 1.5°C. The world's climate leaders are conceding that Earth's ...

I first heard about the Arizona Trail when a friend from my bike racing days set a new women’s self-supported “Fastest Known Time” riding the (now retired) 750-mile route. Elizabeth Sampey had been ...

A study led by University of Arizona researchers shows that decades of groundwater pumping by humans has depleted Tucson-area aquifers far more than natural climate variation. Published in the journal ...

John Galgiani has been waiting for this call. The 79-year-old physician is sitting on a chair in a side office at a health clinic in Phoenix, Arizona, long legs crammed under the table in front of him ...

The Cardinals are set to welcome the Seahawks to State Farm Stadium on Thursday night to kick off Week 4 across the NFL, and when they do, they'll do so with a pretty sweet look in their end zones.