Despite the excitement surrounding the radar signals, researchers caution that liquid water beneath Mars’ south polar ice would be difficult to maintain under the planet’s extreme cold. Without highly ...

Michelle Starr is CNET's science editor, and she hopes to get you as enthralled with the wonders of the universe as she is. When she's not daydreaming about flying through space, she's daydreaming ...

An actor performs during William Shakespeare's theatre play "Hamlet" at the Jerusalem Centre for the Performing Arts in this file photograph dated December 11, 2008. REUTERS/ Eliana Aponte/files ...