The universe contains roughly 2 trillion galaxies and countless mysteries, including dark matter, supermassive black holes, the nature of time, and the absence of observable aliens.

Follow the space program since the moon landing in the four-part documentary "Once Upon a Time in Space". Here’s how to watch ...

Two weeks before his final concert in his hometown of Birmingham, England, Ozzy Osbourne leaned his chin atop his cane and said to his beloved wife, Sharon: "After this gig, I'm looking forward to ...