Follow live updates from NBC News as Russian President Vladimir Putin speaks at his annual year-end news conference on ...

A mysterious excess of far-ultraviolet light seen across the Milky Way could come from the annihilation of clumpy dark matter ...

Astronomers may have discovered the first example of an explosive cosmic event called a "superkilonova," in the form of a ...

This lever set non-printing adding machine has an plain steel case painted black. Seven steel levers painted red move in circular arcs between slots in the case. The case is painted along the edges of ...