Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

Lost Dutchman State Park, at the base of the Superstition Mountains in Apache Junction, is another favorite spot to look for ...

A live-updating map of novel coronavirus cases by zip code, courtesy of ESRI/JHU. Click on an area or use the search tool to enter a zip code. Use the + and - buttons to zoom in and out on the map.

NASA launched a new space telescope to explore the origins of the universe. The SPHEREx mission, which stands for ...