As Mariah likes to say, "It's TIIIIME." The Rockefeller Center Christmas Tree has been lit and Christmastime is officially here! After three hours of show-stopping performances, the massive tree was ...

This year's tree is a 75-foot Norway spruce from East Greenbush, New York. The Rockefeller Center tree is lit and the holiday season is underway in New York City. Host Reba McEntire, Marc Anthony, ...

This Christmas, astronomers are highlighting a spectacular region of space that looks remarkably like a glowing holiday tree. Known as NGC 2264, this distant star-forming region sits about 2,700 light ...

Astronomers are drawing attention to a Christmas Tree-shaped cluster of stars glowing inside one of the Milky Way’s most active stellar nurseries. Known as the Cosmic Christmas Tree, the cluster sits ...