Is 'Planet Nine' Lurking in our Solar System?


Caltech researchers may have discovered a new planet lurking in the outer reaches of our solar system.

Your Playlist Expand Collapse

Full Episodes of Nightly News

Inspiring America

Keeping you Healthy

The Price You Pay

Nightly Films

Lester Holt
Award-winning journalist and anchor of "NBC Nightly News” and “Dateline NBC.”