The new infrared observatory will map the entire sky in 102 colors, probing cosmic inflation and the origins of water.

A new NASA observatory will probe the universe's accelerating expansion and hunt for exoplanets, with launch set for Sunday.

The most-flown rocket in history is on its way out. Here's what the transition means for launch costs, NASA, and the commercial satellite market.

Twenty years after the IAU demoted Pluto, the battle reveals how science, nostalgia, and underdog psychology collide, and why classification still matters.