Arizona’s welcome signs hide history, quirks, and design details most visitors miss. Here are the surprising facts only locals tend to notice.

Pima County Sheriff Chris Nanos and Phoenix FBI Special Agent in Charge Heith Janke said border agents recognized Schlegel's ...

After two decades of quiet data processing on millions of crowd-sourced home computers, the SETI@home project has narrowed down billions of space whispers to 100 signals. Could one of these point to ...

Astronomers found no radio signals from the comet that would suggest it is an extraterrestrial spacecraft. 3I/ATLAS was confirmed as the third known object to enter our solar system from interstellar ...