Tucson-area satellite sensor firm Geost is rapidly expanding its headquarters and lab spaces in Marana to work on major military contracts.

An Extreme Heat Warning will be in effect on the first day of August in the Valley. An Extreme Heat Warning will be in effect on the first day of August in the Valley. On Friday in Phoenix, we'll see ...

The Republican race in legislative district 17 mirrors the battle over the future of the GOP, with traditional business Republicans trying to push back a wave of victories by the ...