A ninth planet could soon be located, according to this scientist searching for evidence of a mysterious object in the outer ...

A six-planet “alignment” will be visible on Saturday, Feb. 28, giving stargazers a chance to view a rare spectacle. But will Kentuckians be able to see it? The planetary alignment, also known as a ...

Stargazers are in for a cosmic treat this weekend weather permitting, as six planets appear together in the evening sky. They should all be visible in the same part of the sky shortly after sunset, ...

Our solar system appears beautifully organized, but its stability is actually the result of an incredibly delicate cosmic ...

Scientists have discovered a bizarre planetary system where a rocky world orbits farther out than giant gas planets, defying long-standing theories of planet formation. The finding hints that some ...