With 3I/ATLAS streaking away from our planet, speculation remains as to whether the interstellar comet is alien or not.

From Viking to Perseverance, scientists have spent decades chasing chemical hints that could point to life beyond Earth.

With Tucson out of the picture for the Project Blue data-center complex, Marana has emerged as a possible prospect for a replacement location. Not only is the town of 62,000 people Pima County’s ...

"It's really not a question of robotic exploration or human exploration," Ehlmann said. "It is an 'and' — it's robotic and ...