Picture a star, about half the sun’s mass shining with a dim red light. Lumbering around it on a 5,000-year orbit is a huge orb called a brown dwarf, which is much heavier than a planet but still not ...

A planet with the same mass as Earth approaches near the Moon's orbit.If such an event were to occur, what would happen to ...

In 2006, a vote by the International Astronomical Union determined that Pluto was no longer a planet. The decision sparked a heated public debate, and many planetary scientists disagreed with kicking ...

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, ...