Galaxies don't float around at random. They line up along strands of cosmic filaments, sometimes stretching millions of light ...

In the new definition, a planet is a celestial body that: Margot and co-authors Brett Gladman of the University of British Columbia and Tony Yang, a student at Chaparral High School in Temecula ...

During its final hours on the lunar surface, the Blue Ghost spacecraft captured stunning photos of a lunar sunset.